TESTING LARGE ITEMS
For testing items that don’t fit on the test plate, use the black lead.
Remove the protective insert and connect to the black socket (-) on the
tester. Clip part of the test-item to the crocodile clip. Touch another part
of the test-item (clean and freshly-filed) with the probe tip.
THIS IS
INSTEAD OF PLACING THE ITEM ON THE TEST PLATE
– SO DO NOT
PLACE THE ITEM ON THE TEST PLATE.
TESTING HIGH CARAT
For testing ‘Asian gold’, which should be about 22ct, you may wish to
know if it is slightly more or slightly less than 22ct. Calibrate the tester on
your 18ct calibration sample, then calibrate it on a 22ct sample. You
might easily calibrate them both to the middle of the “18ct” and “22ct”
area of the dial, or you might have to compromise by setting one or both
of the samples fractionally higher or lower. This is fiddly but it is the only
way (and the only tester of this type) that will test high-carat with a
reasonable degree of accuracy.
CHANGING THE REFILL IN THE PROBE
Hold the centre of the probe
J
firmly, unscrew the end
K
It is the entire middle section that is the ‘probe refill’.