Checkline Mountz RTSX [RTSX50i] Rotary Torque Transducer, Range 5-50 Lb-In, Drive Size 1/4". The Checkine Mountz RTSX Rotary Torque Transducer is for use with most hand tools, power tools or rotational measurement applications. The Mountz RTSX 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 RTSX connected to the PTT & LTT.