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 Ranges Temperature: 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)
Resolution 0.1°F/°C
Measuring Range 1 to 99% RH
Accuracy ±5% RH (40% to 70%)
±8% RH (Other)
Resolution 0.1% RH
General Specifications
Timing Capacity 9 hrs, 59 mins, and 59 secs
Accuracy ±3 seconds/day
Lap Memory 30 laps
12 or 24 hour clock Yes
Time Alarm Yes
Display LCD
Backlit Display Yes
Power Supply CR2032 battery or Solar Panel
Battery Life Approx. 1000 hours (Alkaline)
Product Certifications CE, IPX4
Operating Temperature 14 to 140°F (-10 to 60°C)
Storage Temperature 14 to 140°F (-10 to 60°C)
Operating Humidity Range 0 to 99%
Dimensions 2.7 x 3.6 x 1.0" (68 x 92 x 23 mm)
Weight 2.9oz (83g)