Torque wrench for <10Nm?

Hello together, I already have two torque wrenches that cover the range of 10-320Nm. So far I also got everything that was so hard to get now to my question. Is it useful to buy a third one that can “can” even less than 10Nm? In particular now zb for reversing rollers on timing belts, which usually need 8nm… Or is it “no matter” if I then tighten them with 10nm instead of 8nm. I’m looking forward to your opinion. Thank you very much!