General Tools FW450 Flow Watch for Air and Water with Metal Case Ideal for making precise water/air speed and temperature measurements Displays instantaneous, maximum or average speed plus instantaneous, maximum, or minimum temperature or wind chill Features backlit display and aluminum bottom plate for tripod attachment Temperature measurement range is -4 to 158 degrees F (-20 to 70 degrees C); accuracy is +/-0.38 degrees F (+/-0.2 degrees C) Waterproof; CE and RoHS approved