I've used a lot of torque wrenches in a previous career and truthfully, I have not noticed a lot of difference in performance between a Harbor Freight and a Snap-On. The real "secret" is to use a correctly sized wrench. Don't use an 800 Nm wrench to tighten a bolt to 25 Nm.
I suggest buying an affordable set of wrenches to cover the range of torque settings you need.