After about 15mm the arrow (dial) didn't match what the gradients on the ruler showed so I went back. Hopefully my experience is unique. The caliper itself seemed well made, I hope other buyers have better luck. I bought this metric because I already have an SAE scaled caliper and a year old SEARS plastic metric/SAE caliper, but its scale is SAE only and I needed a metric only caliper for my 3D printing needs.