Checkline Mountz BMX [BMX500i] Torque Reaction Transducer, Range 50 -500 Lb-in, Drive Size 3/8". The BMX torque transducer is designed to meet the requirement of testing multiple torque ranges for various torque tools used in production, maintenance and calibration labs, the versatile torque sensor is used in conjunction with a digital torque display. The torque sensor is a bench mounted calibration instrument designed for torque wrench calibration, torque screwdriver calibration, and electric & pneumatic screwdriver calibration. Controlling torque is essential for companies to ensure their product's quality, safety and reliability isn't compromised.