FUNCTION: This tape measure tool helps you get an accurate reading around curves, corners and hard-to-see places. VARIOUS SIZES APPLICABLE: The tape measure clip is suitable for tape measures of different sizes: 3.5m, 5m, 7.5m. And it has "inch" and "mm" scale for easy reading. HOW TO USE IT: Simply clip it onto a tape measure and slide it into position to get accurate readings. PERFECT MEASURING TOOL: This caliper is an ideal measuring tool for a wide range of industrial, hobbyist and automotive applications to accurately measure internal, external and depth dimensions. PREMIUM QUALITY MATERIAL: The tape measure clip is made of stainless steel, anti-rust, anti-cracking, and high-strength spring clip. Note: The data is all manual measurement, please allow an error of 1 - 3cm, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.