REED R6250SD Data Logging Heat Stress Meter


REED R6250SD Offers

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 Ranges Air: 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)

Accuracy Air: ±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)

Resolution 0.1°F/°C


Measuring Ranges 5 to 95% RH

Accuracy >70% RH: ±(3% rdg + 1% RH)

<70% RH: ±3% RH

Resolution 0.1% RH

General Specifications

Indoor Formula 0.7WB + 0.3TG

Indoor Range 32 to 138°F (0 to 59°C)

Indoor Accuracy ±2.7°F (±1.5°C)

Outdoor Formula 0.7WB + 0.3TG + 0.1TA

Outdoor Range 32 to 132°F (0 to 56°C)

Outdoor Accuracy ±3.6°F (±2°C)

Response Time 1 second

Display 4-digit dual LCD

Backlit Display Yes

Data Hold Yes

Min Yes

Max Yes

Datalogging Capabilities Yes

Real-Time Clock and Date Stamp Yes

Selectable Sampling Rate Yes (1, 2, 5, 10, 30, 60, 120, 300, 600, 1800, 3600 seconds)

External Memory Yes, expandable up to 16GB with SD card (optional)

Auto Shut-off Yes (after 10 minutes/off)

Kick Stand Yes

Tripod Mountable Yes

Low Battery Indicator Yes

Power Supply 6 x AA Batteries or AC Adapter (optional)

Data Output Yes (RS-232)

Product Certifications CE

Operating Temperature 32 to 122°F (0 to 50°C)

Storage Temperature 14 to 140°F (-10 to 60°C)

Operating Humidity Range 10 to 85%

Dimensions Instrument: 7.0 x 2.7 x 1.8" (177 x 68 x 45mm)

Black Brass Ball Diameter: 2.9" (75mm)

Weight 1.1lb (515g)

Don't Lose Your Cool. Manage Work Place and Athlete Heat Stress.

Sometimes we only use the air temperature as a measure of how comfortable we will feel when working or playing outside. But when the days get longer and the sun becomes stronger we need to take into account a lot more than air temperature.

Heat-induced illnesses, such as heat exhaustion and heat stroke occur when your body can't keep itself cool. The evaporation of sweat is slowed on hot and humid days causing your body temperature to rise and become ill.

Symptoms of Heat Exhaustion and Heat Stroke

  • Dizziness, Headache, Weakness, Nausea
  • Rapid Heartbeat, Cramps, Chest Pain
  • Labored Breathing, Lack of Sweating
  • Mood changes such as irritability or confusion
  • High fever (104°F and Higher) for Heat Stroke Victims

Preventing Heat Stress

  • Know signs/symptoms of heat-related illnesses; monitor yourself and coworkers
  • Block out direct sun or other heat sources
  • Rest regularly
  • Drink lots of water; about 1 cup every 15 minutes
  • Wear lightweight, light colored, loose-fitting clothes
  • Avoid alcohol, caffeinated drinks, or heavy meals

And most importantly….Monitor the conditions you are in with a Heat Stress Meter
These meters measure how hot it REALLY feels outside when humidity is combined with temperature, air movement and radiant heat.

What is WBGT or Wet Bulb Globe Temperature?
WBGT index is a term used in industry, sports and other areas to indicate the heat stress level for humans and animals. It calculates the heat stress of radiant heat, which takes into account temperature, humidity, wind speed, sun angle and cloud cover. This type of meter combines these factors into a single number so you can quickly take into account the conditions you are in.

What is Black Globe Temperature (TG)?
Skin can burn when it comes in contact with exposed machinery, tools and containers left in hot direct sunlight. Black Globe Temperature represents the integrated effects of radiation and wind on these objects.

What's included with the REED R6250SD

  • Data Logging Heat Stress Meter
  • Soft Carrying Case
  • Batteries

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