Neo is supposed to be 0.5% accurate.
Have you done a slope test with a known heavy weight on the p2m?
No. 1-2% out isn't much.
Indeed, thought you meant that the p2m was 4% out on top of frictional losses. If it's at 4% out total that sounds reasonable, although maybe try a new chain and pulley wheels :)
@skinny started
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Neo is supposed to be 0.5% accurate.
Have you done a slope test with a known heavy weight on the p2m?