Measure (ring) after use, should be promptly cleaned measurement site attachments, stored in a prescribed measuring box. 
 Production site should be placed in the measuring process with the set-location, gently, to prevent damage to bump measurement surface. 
 Prohibited as a cutting tool to force the measuring screw thread, to avoid early wear and tear. 
 Adjustable thread ring is strictly prohibited non-free adjustment of measuring staff to ensure the measuring accuracy. 
 Ring a long time, due metering management safekeeping.