EPX300 Hardness Tester measuring principle is physically a rather
simple, dynamic hardness test. An impact body with a hard metal test tip
is propelled by spring force against the surface of the test piece.

Surface deformation takes place when the impact body hits the test surface,
which will result in loss of kinetic energy. This energy loss is calculated
by verlocity measurements when the impact body is at a precise distance
from the surface for both the impact and rebound phase of the test.

The permanent magnet in the impact body generates an induction voltage
in the single coil of the impact device. The voltage of the signal is proportional
to the velocity of the impact body, and signal processing by the electronics
provides the hardness reading for display and storage.

Simply put, harder materials produce higher rebound velocity than those which
are less hard (higher L value).

EXP300 Hardness Tester is a direct hardness measurement within any particular
material group (i.e. steel, aluminium, etc.) and can be used as a finaltest result
without any conversion. However, EXP300 Hardness Tester has established
conversions to otherhardness scales for the convenience of our customers.

These conversions to other scales (HRC, HRB, HB, HV, HSD etc.) are programmed
into the electronics and can be shown directly on the display as the test result.
All data is stored in the native L sclae to prevent any possible errors with multiple conversions.