Interchangeable with Sensortronics 65023 and RTI 5123. 3 mv/v, 0.03% combined error, 380/350 ohm, 10 ft 6 cond cable, nickel plated steel. NTEP 89-053A2 S III 3,000 div & M III 5,000 div (3410 w/ thru load hole)