Tonometer

"The dial tension gauge is suitable for relay tip pressure, electronic switch, micro switch, valve, spring pull pressure,
dial measure equipment principal axis pressure, dial system equipment tip and the gag bit
mechanical pressure, tape recorder buffer mechanism pressure, and other precise pressures, pulling force test.
1: Simple to use
2: Refined appearance
4: Tension along allows clockwise direction along an anti-clockwise test, but it always stylus
arm and push in the direction of the vertical tension.
http://www.shcaliper.com/"

Tonometer