Established in year 2002, we are one of the promising suppliers of V1 Type Reference Standard Blocks. These blocks are used in ultrasonic, eddy current, magnetic particle, liquid penetrant, and radiographic testing. Our standard blocks are also provided in alloy steel, stainless steel, copper-nickel, and aluminum. V1 type blocks are used for calibrating ultrasonic flaw detection equipment in both laboratory and industry. V1 Type Reference Standard Blocks include a 100 mm radius, 1.5 mm & 50 mm holes, engraved reference mark scale, and slots at zero point for calibrating signals at intervals of 100 mm range.