The N88-TS Tube Sheet Pit Gauge is designed to fit inside most inch OD (0.500 inch or 12.7mm)Manufacturer: Western InstrumentsWarranty: One Year
The Tube Sheet Pit Gauge is designed to fit inside most 1/2 inch OD (0.500i or 12.7mm) Boiler Tube, where the resulting Inside Diameter is just over inch 0.375 inch or 9.5mm. Without having stating the obvious, the Tube Sheet Pit Gauge will also test larger tube where reaching into the Tube is necessary.
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