Handheld Thermo-Hygrometer


Rense Instruments is pleased to announce our NEW DM-535 Handheld Thermo-Hygrometer. Intended for simplicity, ease of use, and affordability, this product provides simultaneous display of Relative Humidity, Temperature, Dew Point, and Absolute Humidity at a single glance. All models are CE marked.

The DM-535 is equipped with a high accuracy Rense humidity and temperature transmitter that provides an RS-232 signal to the handheld display. The RS-232 digital signal format allows the simultaneous display of four measurands, on a two-line LCD, without the need for a display selector switch. Transmitters are available for English or Metric units.

With the transmitter, coiled cable, and handheld readout together weighing only 10 ounces, the DM-535 is portable enough to be used anywhere, and a single 9V battery will power the unit for several hundred hours.

Rense Instruments has been designing, manufacturing and delivering humidity calibration equipment, RH and temperature transmitters, and thermo-hygrometers for more than 35 years, and is proud to release this new product.


• Performance • Measurement Range (RH) 0-100% RH • Measurement and Operating Range (T) Fixed and standard probe: -20 to +60°C / -4 to +140°F • Sword probe: -20 to +100°C / -4 to +212°F • Remote probe: -20 to + 150°C / -4 to +302°F • RH Accuracy at 25°C / 77°F Fixed probe: ±2% RH (10–90% RH) • Remote probe: ±2 % RH (5–95% RH) • Temperature Accuracy ±0.2°C / ±0.36°F (Pt100 1/3 DIN direct) • Temperature Influence ±0.05% RH/°C, ±0.03% RH/°F • Stability - RH Sensor <±1% RH/year • Response Time <10 sec typical (for 90% of the step change) • Electrical output/input • Supply Voltage 9 VDC alkaline batteries (200 hours battery life approx) • Operating conditions • Operating Humidity • Probe, Housing, Storage • 5–95% RH (non-condensing) • Operating Temperature • Hand meter • -20 to +60°C / -4 to +140°F • Mechanical specification • Ingress Protection IP32 • Housing Material - Meter Molded polymer housing • Weight DM509 + probe: 260g / 9.2oz • DM509 + fixed measurement head: 140g / 5oz • DM509 + sword: 700g / 25oz • DM509 + tube 500mm : 800g / 19.6" : 28.2oz • Electrical Connections RH: 3-wire o T: 3-wire
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