The DM-535 from Rense Instruments Div., Process Measurement & Controls Inc.
, Danbury, CT, simultaneously displays RH, temperature, dew point, and absolute humidity. The humidity and temperature transmitter provides an RS-232 signal to the handheld display and allows the simultaneous display of 4 measurands on a 2-line LCD. The transmitter, cable, and handheld readout weigh 10 oz. and a single 9 V battery powers the unit for several hundred hours. Transmitters are available for English or metric units; all models are CE marked.