Kinematic viscosity is of primary importance in the design and selection of a wide range of petroleum products. Calibrated capillary viscometers are used to measure flow under gravity or vacuum at precisely controlled temperatures.The GD-125 kinematic viscosity meter will encounter some problems during use, such as the heater is not working, the indicator light is not bright, etc., so we pay more attention to some precautions in the operation process. This article mainly introduces the basic composition of the GD-125 motion viscosity meter, precautions, and common problems and corresponding solutions in operation.