The best bang for the buck is HF. I bought a brand new CM 1/2 digital torque wrench. I also bought a slightly used 3/8 SO and used 1/2 SO. I just recently bought a 3/8 HF for $10 on sale. I test the two SO and HF against the digital CM. I couple the other torque wrench with the CM. When it click, I check the digital reading. The 3/8 SO is consistantly about 4 ft-lbf below the CM. The 1/2 SO is consistantly about 10 ft-lbf below the CM. The 3/8 HF is consistantly 2 ft-lbf below the CM. If you are a light user, I would suggest the HF. If you are a heavy user, I would invest in something like Precision Instrument, CDI, SO, etc. I would avoid the CM microtork. The plastic is so brittle and crack easily.