Material: ABS plastic cover, stainless steel Size: total length approximately 23 cm, ruler head width 10 cm, ruler tail width 1.45 cm Weight: approximately 423 grams Measuring range: 0–150 mm Scale process: magnetic strip film Resolution: 0.01 mm / 0.005 inch Power supply: button battery included Applicable for: outer diameter, inner diameter, aperture, step measurement Features: Forged stainless steel surface, resistant to rust, durable Large LCD screen provides accurate readings, clear and easy to read, switchable between metric and imperial units Precise measurement with quick zero return function for convenient operation Knob adjustment allows secure locking of measurements; tighten counterclockwise, loosen clockwise Magnetic strip film offers anti-glare and wear-resistant performance Conversion table printed on the back for easy unit conversion