General Tools and Instruments MMH800 - Manual (Page 10)

CHECKING CALIBRATION
As mentioned earlier, the meter is factory-calibrated for measuring the
moisture level of wood and building materials on different scales. To check the
calibrations, remove the protective cap from the top of the meter, taking care
not to stab yourself with the two sharp pins beneath it. Then flip the cap over
and place the two holes in its top over the meter’s two test pins.
The upper display should read 17.5% ±3% with the meter in wood
measurement mode and 16.4% ±3% in building materials measurement mode.
You can toggle the button to check both calibrations without removing the
protective cap.
If either calibration check produces a readout outside the stated range for that
mode, and the meter is still under warranty, call General’s Customer Service
Department at 212-431-6100 to arrange to return the meter for service or
replacement.
SPECIFICATIONS
Moisture Level Measurement Range 5 to 50% for wood/paper; 1.5 to 33% for building
materials
Measurement Accuracy ±3%
Measurement Resolution 0.1%
Temperature Measurement Range 32° to 140°F (0° to 60°C)
Temperature Measurement Accuracy ±2°F (±2°C)
Humidity Measurement Range 25 to 95%
Humidity Measurement Accuracy ±5% from 32° to 104°F (0° to 40°C)
Display Type/Size 99.9 count LCD with 0.56 in. (15mm) high digits
Droplet Icon Ranges Low/Medium/High moisture: >5%/12%/16% for wood
and paper; >1.5%/17%/20% for building material
Auto Power Off After 3 minutes with 0% reading
Low Battery Warning Level <7.25V
Operating Temperature 32° to 122°F (0° to 50°C) @<80% relative humidity
Dimensions 7.13(L) x 2.17(W) x 1.57(H) in. (181 x 55 x 40mm)
Weight 4.06 oz. (115g) without battery
Current Consumption <20mADC
Power Source 9V battery (included)
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