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Extech HW30: HeatWatch™ Humidity/Temperature Stopwatch

Digital UP/DOWN timer displays Temperature, Humidity, and Heat Index

This HW30 multi-function stopwatch displays a digital up/down timer, temperature, humidity and heat index. The heat index measurement shows how hot it feels when humidity is combined with the actual temperature. Ideal for use in hot weather conditions. Additional features include a 12/24-hour clock, stopwatch, 30 lap/split memory and programmable alarm. HW30 Humidity/Temperature HeatWatch comes with lanyard, battery, and operating instructions.



  • User adjustable Heat Index alarm
  • Stopwatch/chronograph mode with 1/100 second resolution
  • Fastest/Slowest/Average Lap recall
  • 99 lap counter with 30 lap/split memory
  • 10 hour countdown timer with audible beeper warning for the last 5 seconds
  • Programmable alarm
  • Calendar mode displays day, month, and date


Specifications Range
Timing capacity 9hrs, 59mins, and 59secs
Accuracy ±5 seconds/day
Alarm Yes
Countdown Timer Yes
Lap Memory 30 laps
Heat Index 70 to 122°F (22 to 50°C)
Temperature 14 to 122°F (-10 to 50°C)
Humidity 1 to 99%
Dimensions 3.1×2.6×0.8″ (79x66x21mm)
Weight 3oz (85g)


HW30 English Datasheet

HW30 English User’s Manual