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FLIR Systems Extech Humidity/Temperature HeatWatch™ Non-distribution product as customer accommodation. Products for Science Education

Multi-functional timing device features user selectable heat index alarm and measures temperature and humidity. The HeatWatch™ Stopwatch has 6 modes: Time/Date, Heat Index, Chrono Lap, Alarm, Timer, and Chrono Split Mode.

Manufacturer:  FLIR Systems HW30NISTL

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Catalog No. S35735

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  • Programmable heat index alarm
  • Displays temperature, humidity, and heat index
  • Calendar mode displays day, date and time
  • 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
  • 12 or 24-hour clock operation
  • Complete with 1m (39 in.) lanyard and one 3V CR2032 battery
  • HW30-NISTL comes with limited NIST certificate; product certified to stopwatch functions only
  • Timing capacity: 9 hrs, 59 mins, and 59 seconds
  • Accuracy: ±5 seconds/day 
  • 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: 79 x 66 x 21mm (3.1 x 2.6 x 0.8 in.)  
  • Weight: 85g (3 oz.) 


±5 seconds/day
79 x 66 x 21 mm
Stopwatch/Humidity and Temp Monitor
85 g
With limited NIST certificate
1m (39 in.) lanyard and one 3V CR2032 battery
9 hr. 59 min. 59 sec.
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