CNC Machinist Calculator Ultra knows that precision matters — especially when you’re trying to measure micron-level tolerances with calipers that probably came from the bargain bin. If you’ve ever had that “Walmart caliper” moment, the app’s ISO Fits & Tolerance Calculator can save you! It calculates upper and lower limits per ISO-286-1, ensuring your bore isn’t just “close enough.” Combine that with the Boring Bar Deflection Calculator and Surface Finish Calculator to make sure your measurement