It has triple start threads on the chamber cover that permits rapid measurements with a minimum of effort. The cover can be screwed in place by rotating it 720 degrees. The 650 does not need nor have a cover safety valve. Inserts are available to change the cover hole size. A precision rate control valve permits accurate and consistent control over the rate of pressure increases in the chamber while a large precision gauge gives accurate and precise pressure measurements.
All instruments have a pressure relief valve that prevents over pressurization.
Each gauge is checked for proper calibration before it is installed. The model 610 has a 22 cubic foot tank built into its aluminum case. This combination makes a lightweight and compact instrument for field use. All instruments are tested before shipment and guaranteed for 1 year against defect in materials or workmanship. We now offer an instrument that does not require a pressure source.