DeFelsko PosiTector SHD Notice D'instruction page 6

Some causes for the gage to not read properly are the indentor
being damaged, incorrect pressure being applied to the test
block or temperatures beyond normal conditions.
Verify accuracy at the beginning and the end of each work shift.
During the work shift, if the Gage is dropped or suspected of
giving erroneous readings, its accuracy should be re-verified.
1 Pt Adjust
Adjusts the Gage to a known material hardness.
Step 1: Select 1 Pt Adjust from the Cal Settings menu.
Step 2: Press the
be used to obtain an average, typically 3 to 10 readings. The
greater the variation between readings, the more readings should
be taken to obtain an average.
Step 3: Repeatedly measure the known hardness sample using
the on-screen green arrows as a guide. After the final reading,
the Gage will calculate and display an average measurement
value of all readings taken on the sample. If the expected
hardness value is not obtained (within tolerance), adjust the
displayed value up
and press to enter the value.
Cal Reset
Restores the gage back to factory calibration and range settings.
The icon will appear on the display.
0
Cal Settings Menu
Cal Settings Menu
1
button to select the number of readings to
or down
4
to the known hardness value