Delmhorst Instrument JL-2000 - Manual (Page 3)

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The temperature of the leather may affect accuracy of the readings. As the
leather temperature increases, its electrical resistance decreases and indicated
moisture content rises. The lower the temperature, the lower the indicated
moisture content. Depending on the temperature and moisture content, a
“correction” may be required.
The meter is calibrated at 70°F (20°C). No correction is necessary if the leather
temperature is between 50°F and 90°F. As a guideline, for every 10 degrees less
than 50 add one point to the reading; for every 10 degrees higher than 90,
subtract one point from the reading.
TO CHECK THE ACCUMULATED READINGS
This feature displays the total number of accumulated readings, the average of
those readings, and the highest stored reading.

To view the readings, press and release the calibration check key (#2). The
meter displays the number of accumulated readings for one second, then the
average of those readings for two seconds. Then it displays the highest
stored reading for two seconds. The total cycle time is five seconds.

To keep the accumulated readings in memory, release the calibration
check button (#2) before the total cycle time is complete.

To erase all the accumulated readings, hold the calibration check button
(#2) for more than five seconds. All the accumulated readings will be erased
and the meter will display “0.”
CARE OF YOUR METER
To keep your meter in good working order:

Store your meter in a clean, dry place. The protective carrying case provided
is an ideal storage place when the meter is not in use.

Change the 9-Volt battery as needed. Continued use with a low battery may
cause the meter to go out of calibration.

Change contact pins as needed. Keep pin retainers hand-tightened.

Clean the meter and contact pins with any biodegradable cleaner. Use the
cleaner sparingly and on external parts only. Keep cleaner out of the external
connector.