About this item Compact Keychain Integration: Miniature design attaches to keys bags or backpacks for everyday carry convenience High-Precision Measurement: Clear scale markings with ±1mm accuracy for reliable DIY and craft measurements Durable ABS Shell Construction: Impact-resistant plastic housing withstands drops and daily wear-and-tear Dual-Unit Conversion Function: Switchable cm/inch scales accommodate both metric and imperial measurement systems Retractable Button Design: One-touch automatic retraction mechanism enables smooth tape roll-back operation