ECG caliper: Includes one black EKG caliper with protective cover, suitable for ECG mapping, ideal for use in schools and hospitals High-quality material: Constructed from durable metal material, resistant to bending and deformation, designed for long-term use With scale: Protective cover features a built-in scale for measurement reference. Measuring range: 0-6 cm (0-2.4 inches), providing convenient measurement assistance Easy to use: Caliper is adjustable to desired length for accurate readings. Compact design allows for easy storage and portability Wide application: Suitable for healthcare professionals, students, nurses, and doctors for measuring ECG readings and obtaining accurate data for daily needs Color: Black Material: Metal Package Contents: 1 x EKG Caliper Note: The package includes only the items listed above. Other items are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm