This document describes the features and characteristics of the geo-FENNEL FHM 20 12 EN moisture meter, including measurements for wood and building materials, external temperature and humidity probes, and replaceable measuring pins.
The geo-FENNEL FHM 20 is a precision instrument designed to measure moisture content and temperature in wood and various building materials. It features an electrical resistance measuring principle with automatic temperature correction when using the external probe, ensuring high accuracy across different environmental conditions.
The manual details the setup of power supply (2 x AAA batteries), operation via keypad for selecting wood groups and units, and specific calibration steps using integrated tester poles. It also covers safety notes regarding electromagnetic compatibility, care instructions, and a two-year warranty policy.
| Measuring principle | Electrical resistance |
|---|---|
| Wood measuring range | 6 to 99,9 % |
| Building materials measuring range | 3 to 33 % |
| Temperature measuring range | 0 to 60°C |
| Accuracy (Wood) | ±1 %* |
| Accuracy (Building materials) | ±1 % |
| Power supply | 2 x AAA batteries |
The instrument operates on an electrical resistance measuring principle.
Measurements using external probes are automatically temperature corrected to ensure higher accuracy.