Product Name: SEN tonometer features: tonometer pressure applied to the relay contacts, electronic switches, micro switches, valves, springs pull pressure, dial spindle pressure measuring instruments, automatic telephone equipment and armature contact pressure and other mechanical stress, tape recorder buffer device pressure contact point pressure, and other precision pressure, tension test. Features: 1. Easy to use; 2. exquisite appearance; 3. test, as long as the stylus Stubbs objects need to be tested, so that you can move to the desired location from a standstill. Tonometry either a clockwise direction, counterclockwise direction can also be tested, but the stylus arm must always be perpendicular to the direction of pushing or pulling; 4. Tension scoring single needle and double needle. Needle tonometry after the highest measured value, driven pin that stops moving, easy to read test values ??testers.