Involvement:Expert (understands the inner workings) - Ownership:more than 1 month
Tachometer makes very accurate measurements on low and high speed. I have lathe machine tool with variable rotation speed and digital speed indication so I have compared the data: - on speed 25 rpm tachometer showed 25 rpm; - on speed 525 rpm tachometer showed 532 rpm. Also measured the speed of emery wheel. Nominal speed of it is 1400 rpm and tachometer showed 1380 rpm.
Have no cover for infrared diode for storage - be careful with your eyes when you take thermometer out of storage box.
Comes with good quality holder - no needness to buy case for it.
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