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.

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