Because the rust prevention (yellow) is applied with the shaft of torque detector SS series, DD series, and DSTP series. When you install the coupling to the shaft, please remove the rust prevention before installation. The rust prevention can be easily removed with thinner.
The anti-rust oil (solid color) is sprayed on the shaft of a torque detector for small capacity (SS series, MD series and MT series). When you install the coupling to the shaft, please wipe the oil off before installation.
For the support stand of the MT series, either of rust prevention paint or anti-rust oil is processed.