This CDI torque wrench measures torque in imperial units (30 to 250 foot-pounds) and metric units (47 to 332 Newton meters). It features an easy-to-adjust collar for selecting the desired torque.

This ½-inch torque wrench from CDI—owned by Snap-On, which is famous for quality and precision—is about as powerful as they come with an impressive torque range of 30 to 250 foot-pounds.

Effetto Mariposa's Giustaforza torque wrench is small, compact, and easy to use. (Image credit: James Huang) Click-type wrenches are most accurate between 30-80 percent of their indicated range.

In applications where multiple fasteners need to be tightened to the same level in sequence, torque wrenches ensure consistency and uniformity across all fasteners. Consider a cylinder head or crank ...

CDI Torque is owned by Snap-On, and there's a lot of the same DNA in the Snap-On torque wrenches. In fact, the CDI and Snap-On torque wrench use the same all-metal chromed alloy steel body.

Exactly how reliable are you talking? You can get a CDI (Snap-On's torque wrench) 1/2" drive for about $150 on Amazon. That buys you a 12 month warranty and access to service and recalibration.

So we decided to see what a modern clean diesel could do on its home turf, landing here in France and grabbing the keys to a Euro-spec 2008 Mercedes-Benz C220 CDI.