The new TBH 325 series is the ERWEKA hardness- or combination tester series with integrated product memory for up to 20 (optional 50) products developed for those customers who require robust design, easy handling and fast validation without complying 21 CFR 11 regulations (password protected access, Audit Trail etc.).


Via the numeric membrane keypad with alpha-numeric sub-function the nominal hardness in combination with 2 individual plus/minus tolerances and remarks may be stored for up to 20 (optional 50) different products and recalled for testing. Alpha-numeric information such as product name and remarks can be entered using the alpha-numeric subfunction by entering letters similar to writing a message on a mobile phone. In addition the TBH 325 series allows to enter batch (lot) number numeric or even alpha-numeric just before the test-run is started. This entered information will be documented on the print-out or together with the results stored at the computer.

Since the samples are inserted into the test station manually all kind and shapes of samples can be tested. Broken samples may be removed from the test station into an acrylic glass disposal container.

The TBH 325 measures the hardness of samples in a range of 3 – 500 Newton under either “Constant Speed”- or “Constant Force” measurement principle (switchable). The sensitivity (3 – 40 N) as well as the test-speed (0.05 – 3.00 mm/sec. or 10 – 200 N/sec.) may be adjusted. Results may be displayed and printed in either Newton (N), Kilopond (KP) or Strong Cobb (SC).

Calibration of the hardness test station is completely menu guided and may be performed by either weight stones or the electronic ERWEKA AutoCal System. When performing by weight stones the TBH 325 series offers a two-point adjustment where one point is fix (0 kg) and the second one may be selected free within the unit’s measurement range. To assure accurate results within the complete measurement range ERWEKA recommends to set the second calibration point in the middle of the units measurement range, i.e. at 30 kg. On completion of adjustment the accuracy/linearity of the measurement range may be documented by up to 3 points within the measurement range.

Via a SD memory card or USB memory stick the laid down product data can be either secured or easily transferred to any other TBH 325/425.

Via the USB printer interface printer (PCL 3 printer language) can be connected to receive a hard-copy documentation of unit serial number, date/time of calibration, date/time of test-run as well as individual results and statistics. Alternatively the TBH 225, via the Ethernet LAN interface, can be integrated into a computer network to receive the documentation print-out at virtually any network printer.

The Ethernet LAN interface allows to connect a computer with the optional ERWEKA MC.net Software. In combination with this option the TBH 225 series is 100% 21 CFR 11 compliant.

The TBH 325 series is available for measurement of hardness TBH 325, hardness and diameter TBH 325 D, hardness/diameter/thickness TBH 325 TD, hardness/diameter/ thickness/weight TBH 325 WTD.