The spring mechanism ensures constant pressure is applied during measurement, giving you accurate readings every time and allowing you to track your progress with confidence. This tool is designed to do one thing well: accurately measure your skinfold thickness at home. Compared to high-end body fat monitoring equipment, this market-available tool provides better insight into your body fat levels. It doesn't even require batteries! This body fat measuring tool and body caliper is small, lightweight, and independent, fitting easily into your fitness bag. Its durable plastic construction ensures longevity. These calipers provide the same accurate results as other body fat measuring equipment, without the hefty price tag. Name: Sebum Caliper Measurement Range: 0-80mm Color: White Material: Plastic Package Contents: 1 * Sebum Caliper Only the above package content is included; other products are not. Note: Light reflections and different displays may cause the color of the item in the image to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.