Home » Tender for Supply Of Feeler Gauges Made Of Tool Steel, With Specified Sizes Of 0.80 Mm, 1 Mm, 2 Mm, 3 Mm, And 4 Mm. Each Gauge Must Meet Hardness Standards Of 50/55 Hrc And Include A Calibration Certificate Valid For A Minimum Of One Year From An Nabl Approved Labor, India