Not sure, would think it came factory calibrated but seems like I remember seeing an older model where I used to work having the calibration checked with some type of light meter. Not a lot of help I know but I'm pretty sure you can't possibly visually count revolutions and will need special equipment. Just curious, why do you need to calibrate it? If you're not working under GMP regulations or FDA regs you can usually tell by looking at a sample if you're getting the separation you need? If you are planning to use it commercially there are companies that come out and do calibrations on practically anything for a fee. Ok, I have to ask, why buy a centrifuge?
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