The ORIGINAL SCHMIDT Test Hammer is based on the principle of rebound measurement and is very simple in its handing. The impact plunger of the instrument is pressed against the paper roll which compresses a spring. After reaching a certain point, the spring is released and an internal hammer mass is launched against the impact plunger. The amount of hammer mass rebound depends on the hardness of the test piece. This rebound amount is then shown on a scale of 10 to 100. Test intervals of 5 to 10 cm (2" to 4") across the whole width of the roll will give the values for  the Hardness-Profile” within a short period of time. The testing is non-destructive with exception of very light marks that the instrument leaves on the top two or three layers. Such “Hardness-Profiles” will show immediately whether the rolls have the neccessary consistency. Rolls that are too soft, or rolls with inconsistent hardness are immediately recognized and can be rejected before the actual insertion in the press.

The ORIGINAL SCHMIDT Test Hammers are available in three different versions: The standard type L Hammer with an analog read scale. The type LR series with an integral paper chart recorder. The top-of-the-line DIGI-SCHMIDT with digital display and data acquisition features.