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DAYUAN 17 pc Diesel Engine Compression Tester Kit Tool Set A wireless-refrigerant-probe or how to use breathalyserMeasures diesel engine compression from 070 Bar 01000 PSI for accurate diagnostic testing. Includes 9 glow plug adaptors and 4 injector adaptors for wide vehicle compatibility. 17 piece automotive compression tester kit supplied for professional and DIY workshop use. Built in pressure reset valve allows quick, safe pressure release after testing. Adaptors feature quick connect fittings for fast setup and efficient engine checks.