Maintenance Method 1.Welding inspection ruler shall not be piled together with other metal tools,in case it is distorted.Friction between metal parts may cause malfunction and blur scales. 2.Do not wipe scale area with amyl acetate etc.Attention: This product is made and sold by WeldingStop,not original Please Make Sure if the REF code matches If you are uncertain about compatibility of parts please contact us first About Shipping: These items are shipped from China The Standard Express will take 14-28 working days Expedited Shipping will take 4-6 working days If you want to receive the package sooner, please choose Expedited Shipping.