Delmhorst Instrument J-2000 - Manual (Page 10)

PIN TALK
There are two types of contact pins - uninsulated, which were
provided with your meter, and insulated. When using uninsulated
pins, push them in to the wood to their full length, if possible.
This will give you the highest measured reading. Insulated pins
read only at the tip and can be driven to a desired depth to
gather shell and core (gradient) information. Additional types
and lengths of both the insulated and uninsulated pins are
available for specific applications.
CARE OF YOUR METER
To keep your meter in good working order:
hStore your meter in a clean, dry place. The protective
carrying case provided is an ideal storage place when the
meter is not in use.
hChange the 9-Volt battery as needed. Continued use with a
low battery may cause the meter to go out of calibration.
hChange contact pins as needed. Keep contact pins hand
tightened.
hClean 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
&
.
hRemove the battery if the meter will not be used for one
month or longer.
9