What should I do if the caliper's measurement result is inaccurate?

First, check if the measuring surfaces of the caliper are clean—wipe them with a soft cloth to remove dust, oil stains, or debris. Then, verify the zero position: close the jaws tightly, and if the zero mark does not align, use the adjustment screw (on precision calipers) to calibrate it. If the problem persists, check for wear on the jaws or the scale; severely worn calipers need to be sent for professional calibration or replacement.