ZLKSKER 8-Inch Lockable & Adjustable Spring Inside Caliper, Inside ID Caliper, Machinist Measuring tool

This caliper was sufficient for my immediate need, and I suppose that I should not complain to loudly, given the low price, but calling this a machinist's tool is an exaggeration. Using it to make measurements to within 0.1 mm is not a reasonable expectation. The caliper is poorly made: one end was bent a bit, and the measuring tips are not parallel. Because of the shape of the tips, measuring something smaller than about 60 mm may be complicated by the shape of the tips that are not well defined in the way they will meet the inside diameter.