Calibrated M-Series probe with thin film aluminum oxide moisture sensor, BASEEFA certified for II 1 G EEx ia IIC (Tamb = 80 deg C), 3/4inch - 16 striaght thread process connection with citon o-ring, Calibration range of -80 to +20 deg C dew/frost with data to -110deg C, Sintered stainless steel end cap/shield - 100 micron