These cheap ones are not accurate ... in that they have a max +/- 0.02
mm error.
This make them useless for knowing where your controlled point is.
They look good, and almost work .. for a DRO.
A dro is meant to tell you, in abs. terms, whether you are where you
want to be.
The difference between a press, push and sliding fit is -0.01 mm, 0.00
mm and +0.01 mm.
> 6" $25.50
> http://www.grizzly.com/products/0-6-Digital-Fractional-Horizontal-Vertical-Remote-Scale/T21577
>
> 12" $35.00
> http://www.grizzly.com/products/12-Digital-Scale-with-Remote-Readout-Inch-Metric-Fraction/T23012
>
> I added a 6" for Y, 12" for X and Z on my mini-mill all for $106.
> The work great and I can't see buying the $500 and higher DROs.
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