Type Three-Point Gauge or Multi-Ring Tool Gauge are utilized to measure the bit, drill pipe stabilizer, fit joint, drill collar, drill pipe, fishing tool, and other revent tools with different O.D or inclusive O.D. ZG130-320 Multi-Ring Tool Gauge, the measuring range of it is from 130mm to 320mm. ZG150-320 Three-Point Tool Gauge, the measuring range of it is from 150mm to 320mm. ZG300-550 Three- ...