Untested but needle appears to be in the wrong place.
Vintage Daytona America Compression Tester Model 8701 Factory Sealed Broken Lens
Matco Tools Compression Tester CT-65 Gauge And Hose. Truck USA
Matco CT65 Compression Tester
Matco Tools USA CT65 Professional Compression Tester Complete Set w/ Kit Bag
#bp320 Matco Tools CT65 Compression Tester Gauge
Matco Tools Compression Tester CT-65 Gauge And Hose
