I held the ruler against the surface and held it up to the light, the surface showed clear peaks and valleys. I switched to a caliper and ruler and measured a maximum error of 0.025 inch, which is almost a full 1/32. I made sure that when taking these measurements on the 300 grit side the tip of the gauge did not go into the grooves, both sides had about the same maximum deviation. This deflection is 25 times greater than specified and is enough to make it unsuitable for leveling the back of a chisel or lapping a whetstone. I sent my stone back for a new one. Let's hope that the next one will meet the specified characteristics.
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