Yorkshire Precision Gauges LtdStand: G120https://www.ypg-ltd.comInternal Thread Inspection SystemsOur range of Johnson Gage Internal Thread Inspection Systems: Series GJ: Allows the Inspection of Internal threads for Maximum Material / Functional Size and Minimum Material / Pitch Diameter Size of the work piece.Series GJ GJ.pdfOther products & servicesGo & No-Go GaugesIndicating Plug Gauge ODB2 Gap & Step Gauge