●产品描述：
Vernier Bevel Protractor
For accurate angle measurement of machines moulds and jigs and can also be used for assembling and machining. Fully calibrated to 360° with magnifying glass. Supplied with 145, 200 and 300mm plain rules, height gauge and acute angle attachments. Supplied in fitted plastic case.
Specifications:
Straightness of blade: 0.00012" (0.003mm)
Parallelism of blade: 0.00023" (0.006mm)
Parallelism of measuring face: 0.0004" (0.01mm)
Tolerance of readings: +/-5' @30°, 60° and 90°.