Analytical Instrumentation & Environmental Monitoring

New relative humidity hygrometer

December 2015 Analytical Instrumentation & Environmental Monitoring

Michell Instruments has unveiled the MDM25, a new portable relative humidity hygrometer which replaces the model DM509. The device is a hand-held, battery-operated meter and is available with five different types of probes. It is ideal for a whole range of testing and inspection applications as it shows temperature as well as relative humidity values.

Based on polymer present in the device, the highly stable sensor quickly responds to the changes sensed in humidity and a thermistor measures the optimum temperature. Additional parameters derived from humidity and temperature include dew point, wet bulb temperature and absolute humidity. The MDM25 hygrometer can be used as a reference device with humidity generators during RH probe validation or calibration. RH probes are widely used by pharmaceutical companies, laboratories and manufacturers of semiconductors. A secondary reference is used while calibrating together with a humidity generator like the Michell S503. The MDM25’s display orientation can be inverted and can easily be read when the fixed probe is inserted into the S503. The MDM25 facilitates ease of use in varied applications The range of probes available includes a fixed probe, a sword probe and round hand held probes up to a length of 500 mm.

For more information contact Instrotech, +27 (0)10 595 1831,,


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