MDM25 Hand-Held Hygrometer

The MDM25 is a portable, battery-operated handmeter, and is available with a number of different probe confi gurations. It displays relative humidity, temperature and one calculated value, making this hand-held hygrometer suitable for a wide range of applications. The user can choose to display either °C or °F.

Product Features

  • Displays %RH and temperature, plus dew point, absolute humidity and wet bulb temperature
  • Simple to operate
  • Long term stability: ±1% RH over 12 months

MDM25 Probes

Hand-Held Hygrometer

Measurement Units%RH, °C/°F Ta, °C/°F Td, g/m3, °C/°F Tw
Mechanical specification
Ingress ProtectionIP54 - Hand meter only
Hygrometer Housing MaterialMolded polymer housing ABS + rubber surround
Weight300g (10.58oz)
Display ResolutionGraphic LCD 128 x 64 pixels
Electrical output/input
Supply Voltage4.5 V (3 x AA batteries - provide approximately 70 hours of operation)
Electrical ConnectionsM9 5-way triad connector


Measurement Range (RH)0 - 100% RH
Accuracy at 25°C (77°F) Temperature<±0.2°C (±0.36°F)
Stability - RH Sensor±1% RH/year
Response time - RH Sensor<10 sec typical (for 90% of the step change)
Measurement & Operating range (T)
   Fixed and Standard Probe
   Sword Probe
   Remote Probe

-20 to +80°C
-20 to +100°C
-20 to +150°C
Accuracy at 25°C Humidity
   Fixed Probe
   Remote Probes

±2% RH (10 - 90% RH)
±2% RH (5 - 95% RH)
Mechanical Specification
Fixed Probe (FPR)30g
Standard Probe (SPR)90g
Sword Probe (SWPR)500g
Round 300mm Probe (HTPR300)  380g
Round 500mm Probe (HTPR500)620g


Aerospace  Automotive  Beverage Industry  Breathing Air  Compressed Air  Environment  General Engineering  General Gases  Pharmaceutical / Confectionery  Research & Development  Semi-Conductor / Electronics 

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