Dial Indicators, Micrometers, Calipers manufacturer / supplier in China, offering Go and Nogo Metric Thread Plug Gauge M5X0.5 for Checking Tapped Holes, Highly Precise and Thread Plug Gauge M2X0.4 for Qualifying The Thread Size, Metrology Tool M2.5x0.45 Go and Nogo Thread Plug Gauge with 6H Accuracy and so on.