Replace the indentor
1. Screw off the cover screw, and take out the main frame from the hardness tester cover.
2. Then screw off the lock nut with the special wrench equipped with the instrument.
3. Take off the spring sleeve protector, use the another side of special wrench screw off the load adjust screw until dismantle the spring sleeve.
4. Take off the previous indenter and put on a new one,the point of indenter is facing down while install the indenter.
5. Put the new indenter into the main frame, pay attention to leave some space for the lever while screw the spring sleeve,screw the lock nut,make the indenter reveal 5mm from the bottom of the frame.
6. Install the main frame back into the hardness tester cover and screw the cover screw. Re-inspect full scale value.
Calibration of full scale
Screw off the pivot screw, and take out the main frame from the enclosure. Then screw off the lock nut and rotate the dull scale adjusting screw with the special wrench equipped with the instrument. The readings on the dial indicator will be lower down when the nut is screwed off, on the contrary, rise up when screwed. After adjustment, screw the lock nut and re-test on the glass sheet. The indicator should point at 100±1. If there is still any error, repeat the operation above until indicator points at 100±1.