VEVOR Digital Rotary Viscometer, 10-2,000,000 mPa.s(cP), ±2% Accuracy, 100-240V Digital Rotational Viscosity Meter with 4 Rotors and Temperature Probe, LCD Display, Lab Viscometer for Fluid Testing

All devices are calibrated with standard solutions at the factory. You may also use your own certified standard solutions for calibration. If this answer does not resolve your issue, please contact us again for assistance.

2. It is perfectly acceptable to use certified viscosity standards for calibration, but there is one important prerequisite to note: the temperature must be kept constant. This is because the data labeled on the viscosity standards is specific to a certain temperature; you simply need to maintain the same temperature as specified on the standard. If this response does not resolve your current issue, please contact us again for assistance.

1. Rotational viscometers undergo 100% factory inspection. We offer repair services, but we do not provide calibration, as calibration is only meaningful when performed by a qualified third party.

The general principle for viscosity testing is as follows: for low viscosity, use a relatively large rotor at a slightly faster speed; conversely, for high viscosity, use a relatively small rotor at a slightly slower speed. A rotor of size 1 cannot test the viscosity of water; a rotor of size 0 or size 4 can be used to measure high viscosity water.