Unique BACKLIGHT COLOR WARNING feature:
Green when reading <40ppm
Red when reading = or>40ppm
Range: 0-2999ppm
One button operation: Holds reading automatically! Power-off utomatically!
Super power saving: Battery lasts for 5 years under normal use!
Stainless steel probe.
Pocket clip and hang-string included.
Calibration function.
Automatic temperature compensation (option).