The HMP155A provides reliable humidity and temperature measurement. It has excellent stability and withstands harsh environments. It is of solid construction and the sensor element is protected by a Teflon filter, giving maximum protection against liquids, dust and dirt.

The HMP155A outputs a 0 to 1 VDC signal for temperature and relative humidity which can be measured by all Campbell Scientific data loggers.

It can either be powered continuously or switched to conserve battery life, consuming less than 3 milliamperes current at 12 volts.