PM310L - for low pressure calibration: Using PM305 together with a small hand pump it works as a complete, portable, one-hand operated pressure calibrator named PM310L. The hand pump mounted directly on the pressure inlet of PM305 makes it possible to generate pressures from 0 to 40/60 bar (G) using dry air as pressure medium. PM310L is supplied in a case with a complete kit of test hose and fittings.