This BLET humimeter has following features : infrared measured temperature in °C ou °F ; temperature automatic compensation ; measuring surface diameter 16cm 1m distance ; Hold function ; memory 10000 datas. Conductance electronics ; hand electrode for measurement of wood and plaster ;Pair of plug-in electrodes ; Pair of flat electrodes, 300 mm length ; Air humidity and temperature sensor 0..100% ; Non-contact infrared temperature sensor measurement -25 to +125°C ; CO2 sensor up to 5000ppm; plastic case, dimensions 450 x 360 x 106 mm