The SW700 combines a precision stopwatch with a built-in temperature/humidity sensor that calculates heat index and dew point, helping gauge how conditions really feel in the field. It offers a 99-lap counter with 30-lap memory, a 10-hour countdown timer with audible alarm, backlit display, and both solar and battery power in an IPX4 water-resistant housing. Includes a NIST-traceable calibration certificate.