ALTANA Hoffman Scratch Hardness Tester Manual - Manual (Page 9)

8
Maintenance and Care
The scratching tool should be rotated between
series of tests to equalize wear; and replaced
when the edge becomes dulled. It is made of
special tool steel and should give long service
on conventional finishes if used properly. Always
approach the final reading from the lower end
of the scale to prevent overloading and dulling
the cutting edge against very hard substrates.
Do not lubricate the Hoffman Scratch Tester. To
maintain the tester in the best condition, keep it
free from dust and other foreign material. Handle
with reasonable care to prevent damage to the
pivotable beam and store the instrument in its
case when not in actual use.
Maintenance and Care