The wall-mounted Vaisala HMW90 Series HUMICAP® humidity and temperature transmitters measure the relative humidity and temperature of indoor environments, where high accuracy, stability, and reliable operation are required. The HMW90 Series includes models for both current and voltage output. These flexible transmitters offer a variety of options and features. Transmitters are available with an optional display. The HMW90 Series humidity transmitters are quick and easy to install. The wiring is connected secured to the wall through the back plate and the electronics with the sensors can then be easily snapped on. Dip switches for transmitter configuration can be accessed when the enclosure is open.