Caliper & Micrometer Calibration Kit SPI's Calibration Kit is perfect for calibrating and checking accuracy. Set includes... Calibration Certificate traceable to NIST Stand Height: 12" 9 pc Grade-0 Gage Block Set Optical Flat (flatness: .000004" / parallelism: .00002") 3.0mm ball end T-handle hex wrench Fitted Case Steel Gage Block Set includes the following sizes... 0.0625" 0.100" 0.125" 0.200" 0.250" 0.300" 0.500" 1.000" 2.000"