Heat Stress Monitor


Data Logging Heat Stress Meter

Ideal Applications for the REED R6250SD

  • Sports (leisure, organized, and professional)
  • Monitor seasonal conditions to ensure safe environment at school or daycare
  • Ensuring safe work environments


The R6250SD measures temperature, humidity, and direct or radiant sunlight with Wet Bulb Globe Temperature (WBGT). With this information it determines the "What it feels like" temperature. The R6250SD is OSHA recommended with a user-adjustable WBGT audible alarm and the ability to adjust settings for indoor temperature measurement. Featuring, Data hold, Max/Min functions, and an easy-to-read backlit LCD display. Using a SD card (max 16GB), a user can manually record up to 99 readings or automatically by selecting a desired sampling rate from 1 to 3600 seconds. Quickly generate an Excel file with raw data, all without the use of software. Optional accessories include a tripod and AC adapter for continuous long-term monitoring.


  • Measures temperature, humidity, dew point, wet bulb, black globe, indoor/outdoor WBGT
  • Wet Bulb Globe Temperature (WBGT) considers the effects of temperature, humidity and direct or radiant sunlight
  • In/Out function displays the WBGT value with or without direct sun exposure
  • Black Globe Temperature (TG) monitors the effects of direct solar radiation on an exposed surface
  • Adjustable audible alarm
  • User selectable unit of measure (°F or °C)
  • Data hold and Max/Min functions
  • Real-time data logger with integrated SD memory card
  • User selectable sampling rate from 1 to 3600 seconds
  • Easy-to-read backlit LCD display
  • Tripod mount for long-term monitoring
  • Low battery indicator and auto shut off

REED R6250SD Specifications

Measuring RangesAir: 32 to 122.0°F (0 to 50.0°C)
Dew Point: -13.5 to 120.1°F (-25.3 to 48.9°C)
Wet Bulb: -6.9 to 122.0°F (-21.6 to 50°C)
Black Globe: 32 to 176°F (0 to 80°C)
Indoor WBGT: 32 to 138°F (0 to 59°C)
Outdoor WBGT: 32 to 132°F (0 to 56°C)
AccuracyAir: ±1.5°F (±0.8°C)
Black Globe: ±1.1°F (±0.6°C)
Indoor WBGT: ±2.7°F (±1.5°C)
Outdoor WBGT: ±3.6°F (±2°C)
Measuring Ranges5 to 95% RH
Accuracy>70% RH: ±(3% rdg + 1% RH)
<70% RH: ±3% RH
Resolution0.1% RH
General Specifications
Indoor Formula0.7WB + 0.3TG
Indoor Range32 to 138°F (0 to 59°C)
Indoor Accuracy±2.7°F (±1.5°C)
Outdoor Formula0.7WB + 0.2TG + 0.1TA
Outdoor Range32 to 132°F (0 to 56°C)
Outdoor Accuracy±3.6°F (±2°C)
Response Time1 second
Display4-digit dual LCD
Backlit DisplayYes
Data HoldYes
Datalogging CapabilitiesYes
Real-Time Clock and Date StampYes
Selectable Sampling RateYes (1, 2, 5, 10, 30, 60, 120, 300, 600, 1800, 3600 seconds)
External MemoryYes, expandable up to 16GB with SD card (optional)
Auto Shut-offYes (after 10 minutes/off)
Kick StandYes
Tripod MountableYes
Low Battery IndicatorYes
Power Supply6 x AA Batteries or AC Adapter (optional)
Data OutputYes (RS-232)
Product CertificationsCE
Operating Temperature32 to 122°F (0 to 50°C)
Storage Temperature14 to 140°F (-10 to 60°C)
Operating Humidity Range10 to 85%
DimensionsInstrument: 7.0 x 2.7 x 1.8" (177 x 68 x 45mm)
Black Brass Ball Diameter: 2.9" (75mm)
Weight1.1lb (515g)

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