The Mountz BLRTSX73F Brushless Rotary Torque Transducer, Range 18 - 73 Lb-ft, Drive 1/2", # 170237 is for use with most hand tools, power tools or rotational measurement applications. The common "brush bounce" that plagues the accuracy testing of pulse tools is cured when using a brushless rotary transducer. The Mountz BLRTSX connects between the power tool and the joint. Monitors actual torque being applied from the driver to the fastener. Features an instant auto-recognition system of the BLRTSX connected to the PTT.