Manage Workplace Heat Stress with the Kestrel 5400 Heat Stress Tracker

In many jobs the risk of heat stress increases during the hot summer months (such as the ones we are experiencing now), it is important you are aware of how to work safely in heat, the factors that can lead to heat stress, and how to reduce the risk of it occurring.

Heat stress occurs when the body’s means of controlling its internal temperature starts to fail. Air temperature, work rate, humidity and work clothing are all factors which can cause heat stress.

The body reacts to heat by increasing the blood flow to the skin’s surface and by sweating. This cools the body as heat is carried to the surface from within by the increased blood flow and sweat evaporates. Heat can also be lost by radiation and convection from the body’s surface.

Some workers are more at risk of experiencing heat stress:

  • Those wearing heavy PPC clothing which can restrict sweat evaporation
  • High workplace humidity
  • Workers who with a high work rate, road workers for example
  • Exposed workers with no shade or those working in areas with high levels of reflective heat from surrounding surfaces

The above can lead to restricted sweat evaporation, an individual’s deep body temperature rising, the body may then respond by increasing sweat production leading to potential dehydration, increased heart rate. Eventually the body will struggle to control the situation leading to a potentially dangerous heat stress situation.

It is therefore important to have an effective environmental monitoring solution so workers and employees can keep track of the key environmental parameters that lead to heat stress.

The Kestrel 5400 Heat Stress Tracker does just that measuring all the relevant parameters including Wet Bulb Globe Temperature (WGBT), Relative Humidity, Heat Stress Index, and delivery Thermal Work Limit measurements.

You can set thresholds and will be made instantly aware if they are exceeded by a loud buzzer, bright LED beacon and on-screen warnings enabling you to manage dangerous conditions quickly and with accurate information at hand. Uniquely the Kestrel 5400 is also a complete weather station measuring wind speed, maximum wind gusts, temperature, humidity, pressure, wind chill, density altitude and more, making the Kestrel 5400 the ideal product when determining safe working conditions, setting rest breaks, and maximising personnel performance.

All data can be stored and downloaded for records if required.

To order, or for additional information on the Kestrel 5400 Heat Stress Tracker, please visit email or call the technical sales team on +44 (0) 1590 641223

Richard Paul Russell Ltd Continue Growth in Temporary Structures Market

Richard Paul Russell Ltd have over 20 years of experience in the wind and weather monitoring market and have been supplying many customers within the events and temporary structure market including Victorious Festival, StageCo and Baconinflate.

Product solutions have expanded and split into two main areas, handheld and fixed solutions. Handheld devices offer a simple and cost-effective way of measuring wind speed at a local level.

Fixed solutions allow the sensor to be located above the structure roofline in a clear wind path, log data continuously and allow a live view of data from any location using any internet connected device, data can be downloaded into Excel format for records.

A short overview of the most popular options is below:

Handheld Solutions

  • Kestrel 1000 – Pure instant wind speed reading with average for duration you hold it for. This product does not log data and would require the user to manually take note of the wind speed conditions
  • Kestrel 5000 Weather Station – Allows for all weather parameters to be measured and logged on the unit with a Bluetooth link to transfer data wirelessly to PC, laptop, smartphone etc as required
  • Pricing starts from £58.29 to £324.96 ex VAT

WeatherFile Cloud Connected

  • Logs data continuously and stores locally
  • In addition, transfers data over local GSM Cellular Mobile network, WiFi Network or LAN (ethernet cable) to WeatherFile
  • WeatherFile can be viewed from any location with any internet connected device
  • Email alerts can be set to warn if wind speeds exceed certain set parameters
  • Data can be downloaded free of charge without limitations for any time period in .CSV (excel) format
  • Data never lost as stored locally on SD card and also remotely within the WeatherFile cloud solution
  • Complete systems from around £1270 ex VAT
  • This system can also be hired

Richard Paul Russell Ltd systems meet the Institution of Structural Engineers guidance on temporary demountable structures, procurement, design and use and they are available to advise on product selection, installation and monitoring, working with clients in developing bespoke solutions if required.

You can contact our technical team by email or call +44 (0)1590 641223


Maximise effectiveness, minimise waste, and avoid harmful off-target crop spray drift with the new portable, connected 3550AG meter for pesticide spraying applications — the latest from the trusted line of Kestrel® environmental handheld weather monitoring devices. Rugged, waterproof, affordable, and easy-to-use, the 3550AG comes equipped with Bluetooth® connectivity for instant wireless data capture to a mobile device and shareable reports with the free Kestrel® App.

Richard Paul Russell Ltd, announces the release of the Kestrel 3550AG Agricultural Weather Meter. Precise on-site wind, temperature and humidity awareness is the key to avoiding spray drift liability and maximising application results. There is no easier and more affordable tool for this job than the portable, rugged, handheld Kestrel 3550AG. With just your phone and this Bluetooth-enabled weather meter, users can capture critical weather data throughout their workday and anywhere on their operation.

Farmers put themselves and their business at risk every time they spray a field without measuring and documenting the wind speed and environmental conditions.  Off-target pesticide drift can not only cause damage to nearby vulnerable crops but also pose a serious threat to people, livestock, wildlife, and the surrounding community. No matter the size of the operation, effective herbicide and pesticide application is critical to financial success. The Kestrel 3550AG (£189.95 inc VAT) fits in a pocket yet is equipped with factory-calibrated sensors to measure wind speed and direction, relative humidity, and more. Dew Point and Delta T readouts help the applicator avoid wasteful spray evaporation in excessively dry conditions. Plus, carrying a Kestrel in the spray equipment ensures readings can be taken exactly as recommended – at the field location and at the height of the spray boom. Readings from apps or weather reports gather weather data miles away from the farm location and at the required 30 foot height are in no way correct for on-site conditions.


  • Minimum/maximum/average readings
  • Snapshot mode captures and saves all live measurements
  • Bluetooth® Mobile Device Connectivity and Free Kestrel iOS and Android Apps
  • Simple 3-button operation
  • High contrast, sunlight readable LCD display with backlight
  • Rugged design— IP67 waterproof & MIL-STD-810G drop-tested
  • Effortless Record Keeping & Data Export Capabilities

As regulations surrounding drift management get tighter and media and public attention continues to increase, the stakes are higher than ever for applicators and farmers when it comes to accountability. It is imperative to measure and document spray conditions at the time of application to be ready to defend against a claim of spray drift damage . The Kestrel 3550AG with Bluetooth connectivity makes it easy to instantly capture and log accurate weather data with just one-click. The free iOS or Android Kestrel App allows the user to view, manage, save, and export their captured data with just their phone for instant access and convenient reporting on spraying conditions.

To order, or for additional information on the Kestrel 3550AG Spraying Weather Meter, please visit email or call the technical sales team on +44 (0) 1590 641223


Capable and connected for continuous monitoring, and shareable reports, the 3550FW delivers the same rugged reliability and accurate performance that wildfire firefighters have trusted for years while enabling them to capture and share critical fire weather data far more quickly and easily.

Richard Paul Russell Ltd, announces the release of the Kestrel® 3550FW Fire Weather Meter. Kestrel’s newest and most affordable fire weather meter is now more capable and connected. The 3550FW has all the original features and comprehensive weather monitoring capabilities of the benchmark Kestrel 3000 plus a digital compass for wind direction, Kestrel Bluetooth® wireless connectivity for remote viewing and instantaneous sharing of weather data from a mobile device, and an extra coin cell battery to ensure you won’t lose power in the field when you need it most.

The Kestrel 3550FW (£189.95 inc VAT) keeps your team connected with shareable and exportable condition reports with GPS location via text and email right from the free Kestrel App. Even when you are on the move, you can wirelessly log and retrieve data for real-time monitoring and reporting.

Unlike a traditional Weather Belt Kit, the 3550FW captures readings of ten critical weather measurements near instantly, with less reliance on user technique and instrument maintenance. Barometric pressure, altitude, dew point, heat stress index, relative humidity, temperature, wind speed and direction, wind chill and wet bulb are all measured by the Kestrel 3550FW as soon as the unit is removed from its protective cover and held into the air. Ready to be tossed in your pack, the Kestrel 3550FW is IP67 waterproof and Mil-SPEC-810G drop tested.

To order, or for additional information on the Kestrel 3550FW, please visit email or call the technical sales team on +44 (0) 1590 641223

COVID-19 Statement

At present, in line with the governments guidelines we are remaining open. We would ask only those who are in good health or not in the ‘high risk category’ to visit any of our facilities.

As well as our normal cleaning procedures we have taken extra measures in order to try and prevent any contamination or spread on COVID-19.
We have also increased the frequency of our cleaning regime at all our facilities.

Below are the links to the government guidelines regarding COVID-19.

Public Health England (PHE) recommends that the following general cold and flu precautions are taken to help prevent people from catching and spreading COVID-19:
• Cover your mouth and nose with a tissue or your sleeve (not your hands) when you cough or sneeze. See Catch it, Bin it, Kill it
• Put used tissues in the bin straight away
• Wash your hands with soap and water often – use hand sanitiser gel if soap and water are not available. See hand washing guidance
• Try to avoid close contact with people who are unwell
• Clean and disinfect frequently touched objects and surfaces
• Do not touch your eyes, nose or mouth if your hands are not clean

Please keep an eye on our website and social media channels for updates as the situation evolves.
At present our production facility and online shop are business as usual, subject to product availability and delivery. So please feel free to place orders and shop online!
Link below on the guidance on social distancing for everyone in the UK

Richard Paul Russell Ltd at BSS’20

RPR Ltd will be showcasing the full Kestrel Ballistics range at the British Shooting Show, NEC, Birmingham, 14th – 16th February 2020.

From the military elite, competition shooters to recreational hunters, Kestrel’s line of ballistics offerings includes a range of rugged tools built to serve the needs of any shooter. Visitors can view the whole range on Stand E8.

Combining pinpoint onsite environmental measurements and precise ballistics calculations in one compact weatherproof unit, Kestrel Ballistics Weather Meters eliminate the guesswork in long-range shooting. You can always take your best shot even when conditions and circumstances are at their worst. Choose from advanced versions with multi-target data and extreme long-range capabilities to the simpler yet still powerful single-gun, single-target Kestrel 2700 model. The new Kestrel HUD pairs with Kestrel 5700 Ballistics Weathers Meters acting as an eye-level repeater screen to view live targeting data. There’s a Kestrel Ballistics product to meet your needs and maximise your shooting performance.

kestrel ballistics

RPR Ltd will have the complete range on their STAND E8 including two exciting new product launches, The Kestrel 2700 and the Kestrel HUD display as well as the renowned Kestrel 5700 Elite Weather Meter with Applied Ballistics®.

The Kestrel 2700 Ballistics Weather Meter (£219.95 inc VAT) sets the standard for long-range accuracy, reliability, and affordability. Combining onsite wind and weather measurements with an accurate ballistics solver – the K2700 delivers precise firing solutions for dead-on aim at long-distance targets. From competitive target shooters to the lifelong outdoorsmen, the Kestrel 2700 eliminates the guesswork allowing you to be confident in a clean accurate shot on the first-round.

kestrel ballistics

  • Accurate Environmentals – Measures wind speed and direction, temperature, and altitude.
  • G1/G7 Ballistics Solver – Large library of independently tested bullet data
  • User-Friendly – Simple 3 button operation and Easy Mode step-by-step guidance on getting started.
  • Rugged, All-Weather Durability – IP-67 Waterproof, MIL-STD-810 drop-tested, and backed by 5-Year Warranty.
  • Protective Slip-On Cover – Slides over the entire unit for added durability.
  • Load & Go Convenience – Set up in the gun profiles via the app, then leave your phone behind — the 2700 is fully functional as a stand-alone field tool.
  • App Supported Option with LiNK – Easily build, store, and transfer gun and bullet data to and from unit.

The Kestrel HUD Heads Up Display (£499.95 inc VAT) allows you to view accurate real-time targeting data without coming out of the scope. This clear gun-mounted, eye-level display puts live holds from your Kestrel 5700 up front and right where you need them for rapid engagement of multiple targets. Pair the HUD with a Kestrel 5700 Elite Weather Meter with Applied Ballistics to take full advantage of advanced features like the Multi-Target Card and DOPE card available exclusively with the Elite model.

kestrel ballistics

  • Live Updates & Automatic Data – Spotters can feed shooters updated target data on the fly and stage data is immediately viewable on the HUD — no more markers and masking tape.
  • Large Font Option – Improves visibility and focus on critical data while reducing eye strain. Easy to read in direct sunlight and low light conditions.
  • DOPE Card* – Download full range card specific to your rifle and bullet – eliminating the need for pen and paper.
  • Target Card* – View and receive live updates for up to 10 unique targets when paired with the 5700 Elite.
  • Field-Ready Durability – Lightweight but sturdy enough to stay firmly in place for any shooting situation weather-proof and recoil-tested — the HUD won’t get banged up by bumping into a barricade at a match or knocking against a tree on a hunt.
  • Remote Switch Optional Accessory – Change between targets and send target data to your Kestrel without changing your shooting position or allowing target to leave field of view.
  • Countdown Timer – Prepare for competition by tracking your speed to improve performance on every shot.
  • *Available when paired with Kestrel 5700 Elite only.

Whatever your passion in shooting sports– hunting, recreational, or competition – there’s a confidence – inspiring product to fit your needs and goals in long-range shooting. The newest offerings make it easier than ever for shooters of any experience level to immediately improve shot placement under any conditions and quickly get on target.

For further information contact our sales team at or call +44 (0)1590 641223 to showcase Weatherfile wind and weather monitoring range at RYA Dinghy Show 2020

At the 2020 RYA Dinghy Show, developed by Richard Paul Russell Ltd, will be showcasing its range of WeatherFile wind and weather monitoring equipment (stand C9). has been supplying coaches, yacht clubs, watersports centres and events with wind and weather monitoring systems for over 20 years, as well as delivering solutions to the British Sailing Team, professional sailing coaches and numerous sailing and yacht clubs.

On display at the Show will be their full range of system solutions including:

  • The (PRO) Principal Race Officer system which has been developed from a direct requirement of elite regatta management teams to assist in delivering the highest quality racing. The system delivers extremely accurate wind speed and direction measurements with a built-in compass that automatically calculates north regardless of the committee boat movement.
  • The OWS-5 is the ultimate solution for racing coaches delivering unrivalled accuracy of wind speed and direction relative to the ground from a moving coach boat (RIB). A bespoke App gathers the data with live and historical graphs for pre and post training and event analysis. A great advantage of OWS-5 is it requires no calibration when in use.
  • WeatherFile yacht club solutions that can be developed to meet individual club requirements allowing members to view live and historical data via the WeatherFile cloud solution, presented in graph format showing wind speed and direction changes over racing periods. Bespoke clubhouse displays can also be supplied and examples will be viewable at the show.

Richard Paul Russell Ltd are also announcing a distribution agreement for Calypso Instruments, an innovative range of ultrasonic wind sensors offering a highly accurate and cost-effective solution for wind speed and direction monitoring. On display will be a small yacht solution that links directly to NMEA wind speed and direction displays, plus the solar powered portable option with Calypso Instruments Sailing Anemotracker App delivering live wind speed and direction data with no cables.

“We are really looking forward to this years’ show, it’s the perfect place to showcase our range of products and chat with coaches, yacht clubs and dinghy sailors about their needs and requirements and see how our technology can assist them out on the water”, commented David Ellis, Sales and Marketing Manager for

WIN a Kestrel Wind Meter

Visitors to the stand (C9) can also take part in a FREE prize draw to be in with a chance of winning a Kestrel Wind Meter, K1000. One winner will be picked each day of the show with the winner’s draw taking place at 15.00 on the stand, so make sure you take part and drop by the stand on Saturday and Sunday at 15.00 to see if you are a winner.

Throughout the weekend’s team of qualified staff will be available on the stand (C9) to help answer any of your questions and help you find the right products for you.

What’s on at the Show?

There’s lots in store at the 2020 RYA Dinghy Show with visitors of all ages able to enjoy family-friendly show favourites. From the 360° ‘On the Water’ virtual reality sailing experience, to the sailing simulators, activity pool, trapeze rig and the famous RYA Dinghy Show Treasure Hunt. There’s something for everyone, whether you’re an experienced dinghy sailor, or just getting started.

As well as a full line up of expert talks and coaching sessions, you’ll also discover hundreds of boats from beautiful classics to the very latest in cutting edge design along with clubs, classes, boat builders, holiday companies and much more! Plus all weekend there will be plenty of activities to inspire and entertain the whole family.

Get your ticket

Advance tickets are available from October 2019 at a special discount rate of £10.00 for RYA members and £12.50 for non-members. Groups can also take advantage of a special ticket price of £10 when booking six tickets or more. Don’t forget four children go free with each paying adult as well.

Buy your tickets at or call the ticket hotline on 0844 8589069.

For all the latest news and information visit or follow us on Facebook or on Twitter @dinghyshow. Join in: #DinghyShow.

Kestrel featured on Britains Extreme Weather: Superstorms & Heatwaves (Channel 4)

The Kestrel gets another appearance on UK TV, this time on Britains Extreme Weather: Superstorms & Heatwaves (Channel 4)

Morland Sanders looks at climate change and its link to severe weather events in the UK, which has seem tornadoes, torrential rain, lightning storms, flash floods and a record-breaking temperature of 38.7C in recent months. This programme features archive footage, personal stories and striking visuals of Britain’s recent heatwave. He examines whether the nation’s ageing infrastructure can cope with this ever more brutal onslaught, and what effect it will have on agriculture and the cost of living.

You can see the Kestrel being used to check heat levels within the city of London.

For all information on our full range, check out our online secure shop or call 01590 641223 for more information.

88th Round the Island Race

The 88th Round the Island Race took place last Saturday which lead to being very busy providing live data right around the course.  First start was 7.30 am for the largest yachts and Calshot was showing 14 knots coming from the North East.

As the leading yachts gybed down the Solent, with Lymington Starting Platform showing that initially there was slightly better wind on the mainland shore than indicated by  Yarmouth Pier  on the island side.  As the massive fleet sailed under spinnaker down the Solent the next key indicator of the live conditions was provided by the full weather station data from Hurst Castle.

After the slow beat to St Catherine’s and on round the back of the Wight the sailors were again able to know what was going on in Spithead for the last leg to Cowes using the live data from Ryde Pier. has live data from sites across the country, and if you need a Weather station for your Sailing Club or business then please contact us at Richard Paul Russell Ltd.

WeatherFile Wind and Weather Monitoring Equipment at The Showman Show

Richard Paul Russell Ltd have been supplying the temporary structure, festivals and outdoor events market for over 20 years, working closely with major suppliers such as Stageco, Victorious Festival, BBC Countryfile Live, Baconinflate and others.
As festivals and outdoor events are becoming increasingly popular they are growing in size and with that the temporary structures are becoming larger and more complex with greater loads being applied to them. This combined with our ever changing and less predictable weather results in a need for accurate and immediate data on site during construction, setup and whilst the event is running.
Richard Paul Russell Ltd have further developed their WeatherFile wind and weather monitoring solutions with direct connection to its website. This allows live data display at both a local level and via the public internet fulfilling requirements for monitoring of actual loads and weight distribution related to wind speed and direction in line with the Institution of Structural Engineers guidance on temporary demountable structures, procurement, design and use.
Increased functionality including email alerts, and options for staged local audible and visual alarms and/or local colour coded monitor displays ensure operators are kept informed so they can make informed decisions regarding the stability of a structure.
WeatherFile will constantly monitor and log wind and weather data which is invaluable for analysis and future reference, covering weather parameters such as wind, air temperature, relative humidity, barometric pressure, dew point and precipitation.
Data certainty is ensured by using WindSonic solid-state ultrasonic technology with certified accuracy that provides many advantages over conventional cup anemometers and vane sensors, having no moving parts that can jam, break or wear out. This makes them the perfect choice for the temporary structure market where durability, maintenance free use and accuracy are of paramount importance.

MarqueeRichard Paul Russell Ltd are experts in developing bespoke solutions with clients regardless of power availability, remoteness or the harshness of the environment.
Our qualified staff will be available during the show or for further information contact our sales team at or call +44 (0)1590 641223