How to maintain a marble square ruler

Although the marble square ruler will not deform or affect its accuracy due to the impact or knocking of hard objects, the marble square ruler will drop stone slag and produce pits when the hard object hits its working surface. If there are too many or too many pits on the working surface, it will affect the accuracy of the marble square ruler. Therefore, when measuring workpieces or using them, attention should be paid to handling them gently to avoid too many pits, which will affect their use and appearance. When marble rulers are not used for a long time, they should be wiped with lubricating oil. If there is no lubricating oil, edible oil can be used instead. When using them again, dry them with a soft cloth. When the surface is dirty, it is advisable to clean the stains with some lighter corrosive agents such as lemon juice or vinegar. Do not use soap or baking soda, which are easily damaged

理石本质的物料来擦拭。