ACE Instruments offers Digital Pirani High Vacuum Gauges. ACE Instruments offers products for various industrial process control instrumentation like pressure, temperature, relative humidity, etc. The Digital Pirani High Vacuum Gauges are designed with Single Pirani Gauge Head having KF Clamp Optional Dual Gauge. It is based on Pirani Principle established on Thermal Conductivity of Gases for measuring Negative Pressure [Vacuum].