Thread Gauge

Peter Hirt Thread Gauge Feelers are equipped with two ruby balls. The feelers are available from the smallest size 0-200 with a ball diameter of 0.200 mm up to size 12 with a diameter of 4.000 mm. The smallest Thread Gauge Feeler size 0-200 with a ruby ball diameter of 0.200 mm is designed for measuring of threads down to size M1.7. The Thread Gauge Feelers are available as single unit or in a set of 12, 13 or 14 pieces in a protective wooden box.