Product details:

CDI Torque 401SM Torque Screwdriver - High-Precision and Safety The CDI Torque 1/4", 5-40' lb torque screwdriver is best suited for the electronics industry and for instrument assembly work. With a unique adjusting knob and easy-to-read window scale, torque settings can be easily changed. Loaded with safety features like positive lock mechanism, rest assured that the settings are not changed accidentally. Adjusting this screwdriver is also very simple, just pull out the adjusting knob to unlock, turn to the desired setting, then push the knob in until it clicks.