Leybold Oerlikon mechanical vacuum gauge, capsule vacuum gauge. The pressure is determined directly by recording the force acting on the surface of a diaphragm. In this case of direct (or absolute) pressure measurements, the readings obtained through the vacuum gauge are independent of the type of gas and the pressure which is to be measured. The pressure range is approx. from 1000 mbar (atmospheric pressure, 750 Torr) to 1 mbar (0.75 Torr).
This is a Oerlikon Leybold THERMOVAC TM 101 digital portable vacuum gauge designed to accurately measure vacuum levels from atmosphere to 1 micron (0.01 mbar, 1 Pa). These vacuum gauges are battery operated and can be used to test vacuum pressure in remote locations. It utilizes Oerlikon Leybold Vacuum's proprietary Pirani sensor, the most accurate vacuum sensor in its class. The THERMOVAC TM 101 vacuum gauges are 9VDC battery operated with KF16 vacuum flange fitting.