Which measuring faces do you use?
List outside jaws, inside jaws, depth rod and step faces as applicable. For a long-jaw, offset or blade caliper, a photo of the jaws alongside the instrument label helps RTS identify the design.
Record the scale and the inspection size
Give the measuring span, the smallest scale division or displayed increment, and the unit on your work instruction. If a drawing calls for an internal dimension at a particular size, include that size in the request.
A caliper that reads differently near the jaw tips
If two inspectors obtain different results on the same pin, record where each inspector placed the pin along the jaws. A comparison near the tips and a comparison close to the beam involve different contact areas. Tell us which position your inspection instruction uses and whether a jaw face has a nick or worn patch. Keep any recorded values with the tool when it leaves the bench.
A closed-jaw zero and a reading on one outside diameter only give evidence about those checks. List the functions that actually release parts, including a particular slot width or hole depth where relevant.
Booking a set of calipers
List each caliper under its own serial or shop asset number, even when several are the same model. Flag a stiff slide, chipped jaw or damaged depth rod so the team can discuss its condition before booking the work.
Calibration tester for calipers
A calibration tester for calipers may provide fixed reference steps, adjustable distances or several contact arrangements. Send its drawing, model and assigned reference values. Identify the faces used for outside, inside or depth checks and list the requested distances. The tester is a reference device with its own measurement requirement; calibrating a caliper on that device does not by itself establish the tester's values.