DigiMax Digital Caliper Inch & Metric. 6.0"/150mm OAL. Reading 0.0005". Non-metallic high-tech material with 60% fiber glass content. 5 digit digital display with 7.5mm numeral height for easy reading. For outside, inside, depth and step measurements. Switches on automatically when used and switches off automatically after five minutes of non-use. Zero setting possible in every position for quick comparison measurements.