REED SW700 Heat Stress Stopwatch


This water resistant (IPX4) stopwatch features a 10 hours countdown timer and built-in calendar that displays day, month and date. The SW700 is battery and solar powered and has the ability to measure temperature, humidity, heat index and dew point. This stopwatch combines air temperature and relative humidity measurements in an attempt to determine the human-perceived equivalent temperature or "how hot it feels".


  • Measures temperature and humidity, calculates heat index and dew point
  • Stopwatch/chronograph mode with 1/100 second resolution
  • Calendar mode displays day, month and date
  • 99 lap counter with 30 lap/split memory
  • Fastest/Slowest/Average lap recall
  • 10 hours countdown timer with audible beeper warning for the last 5 seconds
  • Programmable alarm
  • 12 or 24 hour clock operation
  • 48" nylon lanyard
  • Backlit LCD display
  • Silent operation option
  • Battery and solar powered


Measuring RangesTemperature: 23 to 122°F (-5 to 50°C)
Heat Index: 70 to 122°F (22 to 50°C)
Accuracy±1.8°F (1.0°C)(32 to 104°F(0 to 40°C))
±3.6°F (2°C)
Measuring Range1 to 99% RH
Accuracy±5% RH (40% to 70%)
±8% RH (Other)
Resolution0.1% RH
General Specifications
Timing Capacity9 hrs, 59 mins, and 59 secs
Accuracy±3 seconds/day
Lap Memory30 laps
12 or 24 hour clockYes
Time AlarmYes
Backlit DisplayYes
Power SupplyCR2032 battery or Solar Panel
Battery LifeApprox. 1000 hours (Alkaline)
Product CertificationsCE, IPX4
Operating Temperature14 to 140°F (-10 to 60°C)
Storage Temperature14 to 140°F (-10 to 60°C)
Operating Humidity Range0 to 99%
Dimensions2.7 x 3.6 x 1.0" (68 x 92 x 23 mm)
Weight2.9oz (83g)