The BM31 is an electronic moisture indicator that can be used to quickly and easily detect near-surface moisture in various materials and to localize moisture distributions in walls, floors or ceilings in a time-saving manner. Due to the dielectric measuring method, the moisture indication is absolutely non-destructive, no electrodes or probes have to be inserted into the measured material. The BM31 is not only immediately ready for use, it also impresses during the measurement with its fast response times and shows the user helpful additional information such as minimum and maximum values on the easy-to-read display with background lighting in addition to the current real-time measured value at the touch of a button. In addition, the current measured value can be recorded using the hold function. With the BM31, not only is it possible to quickly indicate a wide variety of material moisture values close to the surface, it is also particularly well suited for preliminary testing of the readiness of building materials for covering during CM measurements. Advantages for the practice: Development, design, production: 100 % Trotec. Fast and non-destructive indication of moisture distribution in areas close to the surface. Useful pre-testing device for CM measurements. Minimum value, maximum value and hold function. Automatic function and battery test. Can be used immediately. Illuminated display. Automatic switch-off. Practice-optimized German industrial design protected design.