Happy Holidays!
I use this one and like it a lot. There's clones on Ali with different ranges (Enlee "bike torque wrench" or somesuch)https://www.amazon.com/BIKE-HAND-YC-637-BITS-Measurement/dp/B07MVLVGJ5Mine seems to be precise enough when measured with another wrench.
I missunderstand myself : I mean tightening torque in Nm.
On that style seat post clamp, I only tighten screws until they are firm. I never over tighten and make sure I apply lots of carbon paste.