Tru-Test EC-10 User Manual page 10

To ensure that the plate meter accurately measures the compressed height of
pasture, the plate meter must be calibrated. This requires setting a base level of zero
so measurements can be benchmarked against this. If the plate meter does not
return to zero after each reading, it will not record the measurement - hence the
plate meter will not beep.
If, for any reason, the plate meter is out of calibration, it will need to be recalibrated.
To calibrate the plate meter:
1 Hold the plate meter at the bottom of travel and ensure that the plate
meter is switched off.
2 Locate the zero adjustment screw (beside the On/Off switch).
3 Remove the protective rubber bung by levering it out gently using a flat-
bladed screwdriver.
4 Hold down the "Count" button while switching the unit on. The display
will change to "CAL" briefly and display a colon (:) followed by a number.
The colon (:) signifies that it is in fine calibration mode.
As an example, you might see ":5" when you switch on.
5 Using the flat bladed screw
driver, turn the yellow plastic
or steel shaft within the cog,
anticlockwise, until the
display reads "0".
The cog and steel
shaft must remain
stationary.
Do not turn the
shaft beyond this
point or you may
damage the plate
meter and void the
warranty.
6