Carol,
The ones I would recommend would be from Snap-on Tools. They are costly, but accurate & you only buy it once.
There are many different torque wrenches out there, so its hard to point to one that will work. If he's just doing "weekend" type maintenance, an "Adjustable click type", 3/8" drive in "Foot Pounds"(20-100 f-p, p/n: QD2R100A ) is what I'd recommend. If he's into rebuilding engines & such on a regular basis, a 1/2" drive also in FP, might be more up his alley?
Here's a link to their current line:
https://store.snapon.com/SearchResul...=0&FieldValue=
If you're looking to keep it on the cheap, one having similar specs to the Snap-on's could be had from either Harbor Freight Tools, or Northern Tools. Both have websites to order from, and are dependable for having stock & reasonable shipping rates. A word of caution on these however: They will likely be made "offshore", & calibration & reliability might not be the same as what Snap-on consistently provides.
Hope this helps...