COMPACT VALVE TESTER the instrument is highly sensitive and can detect the leakage of LPG up to 0.5 gmhr within 3sec. Of time. The instrument is designed to check both the possible leakage regarding the SC valve fitted on Domestic LPG cylinder. The probable leakages are: The leakage of LPG from the spindle of valve and the probable leakage through the joint seal fitted in between the SC valve and regulator, after the fittment of regulator.