This BLET humimeter has following features : infrared measured temperature in °C ou °F ; temperature automatic compensation ; measuring surface diameter 16cm for 1m distance ; Hold function ; memory 10000 datas. Included : conductance electronics ; hand electrode for measurement of wood and plaster ; Air humidity and temperature sensor 0..100% ; CO2 sensor up to 5000ppm; Non-contact infrared temperature sensor measurement -25 to +125°C ; plastic case, dimensions 340 x 275 x 83 mm