I have a 1/4 inch beam Park Tool torque wrench. I needed a bigger range than it's maximum, so I got a cheap Harbor Freight click type wrench.
I compared the two within the range of the park tool one, and the Harbor Freight one was quite close to the accurate Park Tool wrench. It's good enough for bike bolts.
I don't usually torque things like seat posts to the maximum recommended torque anyway, if it holds without slipping. The torque wrench is more for 1--not exceeding maximum torque, 2--consistent torque on multiple bolts, like stems or chainrings.