Technical Data:
Meet international standard API5B
Measure taper of internal thread
Range (L): 5 1/2-16in / 139.7-406.4mm
Dial indicator stroke: 0.5in
Dial indicator graduation: 0.001in
Accuracy: 0.0015in
Taper calculation formula: taper = A/H
A is the reading difference of two measurements
H is the distance between two measuring positions

Dimensions:
Ball/contact diameter=dia.1.448mm

Supplied Contents:
Extension rod sizes: 6 5/8in, 7in, 7 5/8in, 8 5/8in, 9 5/8in, 10 3/4in, 11 3/4in, 13 3/8in, 16in

Remark:
With 9 extension rods

Optional:
Ball points: 6252 series