Saw this on a Matco tool show on SPIKE TV today...


https://www.matcotools.com/catalog/p...ORQUE-ADAPTER/



Features & Benefits
Converts any 1/2" ratchet or breaker bar into a digital torque wrench
Torque range: 10 - 250 ft./lbs
LED back-light
Swivels 240°
Flip screen with 180° view
10 memory settings
Calibratable

Similar at Home Depot

http://www.homedepot.com/p/Powerbuil...0962/203117027

These worth the investment? The HD one states you can use it to calibrate the torque wrenches you already own? Any input on that?