Squeeze DynamometerA new and improved design provides an inexpensive yet accurate way to measure finger and hand strength. Just squeeze the bulb to get a readout of the maximum generated force. Reading remains until the unit is reset. The bulb is made of standard silicone. The gauge is calibrated in pounds and kilograms in 2. 2lb (1kg) increments at lower levels and 4. 4lbs (2kg) at upper levels to ensure accurate test results.