Hi, "cfiiman": This does look like a good Christmas present for one's own
use!! I would look at it as one tool in a growing group of torque wrenches that
you do/will need as explained below.
From the Brownline website:
"Patented Double Gear Sensing System
Designed,
engineered, and tested by Brown Line Metal Works, the patented* D.G.S.S.
technology ensures repeatable accuracy of +/- 3.5% both clockwise &
counter-clockwise
Accurate from 20 – 100% of full scale (7% accuracy from
10
– 20% of full scale)"
"Range
15 – 150
ft/lbs
180 – 1,800
in/lbs
20.3 – 203 Nm"
"cfiiman", reading the
following statement carefully: "
Accurate from 20 – 100% of full scale
(7% accuracy from 10
– 20% of full scale)"...AND doing the required
calculations, this wrench would NOT be ideal for torque applications in the 20
ft-lbs. applications that you mentioned (or anything else below 42 ft-lbs.) due
to it's error factor. At "
10 – 20% of full scale" (in other
words, from 28.5 to 42 ft-lbs), there is a possible 7% error rate. Below 28.5
ft-lbs, skip this wrench altogether and choose one with an appropriate
scale.
Please note that these same warnings apply to micrometer
click-type torque wrenches be they Snap-On, Craftsman, Harbor Freight,
etc.
MORAL: To work on any car, including a Viper, one NEEDS range
specific torque wrenche
S to avoid problems.
BY THE WAY...while I still slip into my "old ways" and say
"foot-pounds" referring to torque...the correct terminology is "pound-feet"