Psychrometer DTH31 Digital Psychrometer

The DTH31 Digital Psychrometer is an advanced handheld humidity and temperature meter. Its triple display shows three parameter readings simultaneously. It has everything you need to charge an air-conditioning system and determine heating, cooling, and ventilation needs. It gives you incredibly fast and accurate wet bulb, dry bulb, and dew point measurements. One year limited warranty.

Features
Ambient temperature (T1)
External temperature w/probe (T2)
RH humidity
Dew point
Wet bulb
T1 - T2
T2 - Dew point (check difference of dew point to surface)
Display resolution 0.1 ?C / ?F
Protective sensor cap
Sensor: Electronic capacitance polymer film
Condensation will not affect accuracy
Hold
MIN/MAX
?C or ?F switchable
Low battery indicator
Self-calibration
Pocket size design
Reset
Auto off with selectable delay
Auto off by-pass