The primary advantage of Perma-Cal® Direct Drive gauges over conventional C-tube type gauges is simple, there is only one moving part.  Our gauges have no gears, linkages or springs to wear or break.  This design is easily adaptable to meet your desired performance specifications.

Our aerospace gauges maintain their structural integrity and accurate calibration in the most demanding environments, even during prolonged and rugged use.  Direct Drive design is ideal for environments experiencing intense vibration, pulsation and shock.  In addition, our gauges are internally dampened eliminating the need for liquid fill.

Perma-Cal® gauges have a unique helically-wound bourdon tube (elastic element) attached directly to the pointer shaft.  This provides a very linear reading gauge that maintains its accuracy and eliminates the need for any movement amplifying gears or linkages (the parts of a C-tube gauge that fail most frequently).