Inside Micrometer Hole Inner Diameter Gage Gauge 5-30mm Range 0.01mm Precision Measuring Tool CaliperFeatures:High quality alloy gage gage heads can be used for various internal size measurements, fine workmanship and burr-free. Clear the laser marking line for comfortable reading. The main body of the micrometer is made of stainless steel with chrome plated surface, wear-resistant and durable. Designed with locking device, precise machine design make it more intuitive and convenient to read. Built-in ratchet device provides accurate, repeatable readings. Specifications:Type: Inside Micrometer Measuring Range: 5mm - 30mm Material: Stainless Steel Accuracy: 0.01mm Weight: 268g (Approx.) Zeroing: Clean the surface of the anvil heads with a cloth, and then rotate the measuring device to get two measuring surfaces. If the two zero lines of the differential sleeve and the fixed barrel are not aligned, the following two adjustment methods should be used. Method I, if the error is less than 0.02mm (0.001"), use the ratchet stop to lock the screw tightly, and then use the wrench to pull the fixed barrel to align the two zero lines. Method II, if the error is greater than 0.02mm (0.001"),Step1, use the Ratchet Stop to lock screw tightly, then use the wrench to loosen the Ratchet Stop and remove the differential sleeve. Step 2, realign the zero lines of the fixed barrel and differential sleeve, then insert the Ratchet stop back. If necessary, adjust it again using method I. Note: There is no need to calibrate the micrometer during common use. A micrometer only needs to be calibrated if it is severely worn. Package Included:1 x Inside Micrometer1 x Key1 x Calibration Ring1 x Packing Box1) We accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow.2) payment must be made within 3 days of placing the order.3) if you are unable to check out immediately after the listing ends, please wait a few minutes and try again, payments must be completed within 3 days. About Shipping1.