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BM31 Moisture Indicator
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  5. BM31 Moisture Indicator

BM31 Moisture Indicator

Quick localisation of near-surface moisture

Quick and non-destructive indication of moisture distributions in near-surface areas

The BM31 is an electronic moisture indicator by use of which one can quickly and easily detect near-surface moisture in different materials and expeditiously locate moisture distributions in wall, floor and ceiling.

Owing to the dielectric measurement method, moisture indication takes place in an absolutely non-destructive manner, no electrodes or probes have to be inserted into the material to be measured.

The BM31 is not only ready for immediate use, during measurement it also impresses with fast response times and at the push of a button shows the user helpful additional information such as minimum and maximum values in addition to the current real-time measured value on the easily legible back-lit display.

Additionally, the momentarily measured value can be recorded via the hold function.

With the BM31 it is not only possible to quickly indicate different near-surface material moisture values, it is also especially suited for the preliminary check of the building materials' readiness for covering for CM measurements.

BM31 – Special equipment features

BM31 – Special equipment features
Humidity indicator BM31
Side view
Humidity indicator BM31
Power supply: 9 V 6F22
Humidity indicator BM31
Immediately usable

Development, design, manufacturing: 100 % Trotec

Moisture Indicator BM31
Fast and non-destructive indication of moisture distribution in near-surface areas
Moisture Indicator BM31
Practice-optimized German industrial design - protected design patent
Moisture indicator BM31
Minimum value, maximum value and hold function
Technical data in comparison

A direct comparison of all moisture meters:

In order to find exactly the right moisture meter for you, you have the possibility here to clearly compare all moisture meters from Trotec.

Models that you do not wish to include in the comparison can simply be clicked away.

Technical data in comparison

A few practical benefits:

  • Development, design, production: 100 % Trotec
  • Quick and non-destructive indication of moisture distributions in near-surface areas
  • Useful pre-examination tool for CM measurements
  • Maximum or minimum value and hold function
  • Automatic testing of functions and batteries
  • Ready for immediate use
  • Optimum price-performance-ratio
  • Backlit display
  • Automatic switch-off
  • Practice-optimized German industrial design – protected design patent


BM31 Moisture Meter show in Trotec online shop

Technical data

Technical data
General information
  Article number 3.510.205.031
Wood moisture [%]
  Min. measuring range | Wood moisture [%]
  Max. measuring range | Wood moisture [%]
  Resolution | Wood moisture [%]
  Accuracy | Wood moisture [%]
  Measuring principle
  Min. temperature compensation [%]
  Max. temperature compensation [%]
Material moisture [%]
  Min. measuring range | Material moisture [%]
  Max. measuring range | Material moisture [%]
  Accuracy | Material moisture [%]
  Resolution | Material moisture [%]
  Measuring principle
Material moisture [digits]
  Min. measuring range | Material moisture [Digit] 0
  Accuracy 1
  Resolution [Digit] 1
  Measuring principle Dielectric/capacitive
  Min. penetration depth (non-destructive) [mm] 5
  Max. penetration depth (non-destructive) [mm] 40
  Max. measuring range | Material moisture [Digit] 100
Power supply
  Internal (battery) 1 x 9 V battery
Device control
  Push buttons
Ambient conditions
  Operation - min. temperature [°C] 0
  Operation - max. temperature [°C] 50
  Operation – min. relative humidity [% r.F.]
  Operation - max. relative humidity [% RH] 80
Housing design
  Length (packaging excluded) [mm] 180
  Width (packaging excluded) [mm] 35
  Height (packaging excluded) [mm] 45
  (packaging excluded) [kg] 0.18
Standard scope of delivery
Standard scope of delivery
  Measuring device
  Operating manual
  Protective cap
  Electrode tips (1.5 x 20 mm)
  Electrode tips (2.2 x 8 mm)
  2 x union nuts
  Wood type directory
  Factory test certificate
Ascertainable measured values and functions
Internal sensors
  Material moisture [digits]
  Wood moisture [%]
  Material moisture [%]
Functions and features
  Minimum value display
  Maximum value display
  Measured value hold function
  Automatic switch-off
  Non-destructive measurement method
  Backlit display
  Acoustic alarm function
  Selection sensor characteristic map (sens)
  Unit 2
  Selection of wood material characteristics (Mat)
  Temperature compensation
  Manual temperature setting
  Automatic functional test
  Automatic battery test
  Mode selection slide control
  Retaining clip

 standard equipment

 optionally available

 not available



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