2004JJF 1126-2004 Calibration Specification for Ultrasonic Thickness Instruments
1986JJG 403-1986 Verification Regulation of Ultrasonic Thickness Gauge
JJG 403-1986 Verification Regulation of Ultrasonic Thickness Gauge was changed to JJF 1126-2004 Calibration Specification for Ultrasonic Thickness Instruments.