From Cobalt 327
For el cheapo scales, the two Cen-Tech scales I have from Harbor freight haven't let me down so far. One has been used for years.
I have a shadowgraph that came with my engine balancer machine. It now gets a lot of dust accumulation.. A few years ago I bought a HF Cen-Tech cheapy scale, made a tray for the top and I actually prefer to use it. Quick, accurate, easier to read and has lasted well.