Check your caliper’s inside and outside measurements. These calibration checkers work with electronic, dial, and vernier calipers. They come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Inside Size Measured	Outside Size Measured	Accuracy	Material	Container Type		Each
0.5", 1.5", 2.5", 3.5", 4.5"	1", 2", 3", 4", 5", 6"	±0.0002"	Steel	Case	0000000	0000000
12.5mm, 37.5mm, 62.5mm, 87.5mm, 112.5mm	25mm, 50mm, 75mm, 100mm, 125mm	±0.005 mm	Steel	Case	0000000	000000