Review on UM6500 Handheld Digital Ultrasonic Thickness by Fernando Ramani

The resolution appears to differ by about .040" when measuring a .907" cast iron main bearing cap as a test before checking the Chevy small block cylinder bore thickness. I've tried all three iron settings, C02, C10 and C11, but C10 gives the closest reading of 0.866" with actual measurements of 0.907" on Mitutoyo digital calipers. I'm getting realistic readings of around 0.266" for cylinder bores, but without the 5mm gauge block that should have come with the gauge I can't trust that. It was missing when I opened the box and I was hoping to work around that. , but can't seem to find a way to prove the variance or accuracy of the readings. Also, the acoustic binder's little bottle is empty and was never registered in China, so the factory doesn't use calibration blocks and acoustic binders. . You have just received an empty bottle. This means that people at the factory just put the empty bottle in the case. The probe is too big to work really well on round surfaces with a 4.155" hole, but the fit will improve if the hole is larger and I'm still getting plausible readings despite being 0.040 at .907" thickness inches are less. The probe works with a dab of binder (I bought a separate tube just in case) and a steady hand. The thickness of the deck is around 0.560 inches, which may be true. If I knew for sure I would change my rating because this is a cool gauge for the money.