Features: Switchable 3 measurement units: µm/mm/mil Color backgrounds available: BLUE, ORANGE, RED, PURPLE, GREEN, GRAY Battery volume display: Yes Zero Calibration: Yes Basic Calibration: Yes Offset Calibration: Yes Single/Continuous Measurement: Yes Auto Power Off: Yes Screen rotation: Yes Screen brightness selection: Yes Data storage: Yes Specifications: Measurement range: 0~1500um/0~59mil/0~1.5mm Min diameter of magnetic metal substrate: 12mm Min thickness of magnetic metal substrate: 0.5mm Min radius of curvature for magnetic convex substrate: 2mm Min radius of curvature for magnetic concave substrate: 11mm Min diameter of non-magnetic metal substrate: 50mm Min thickness of non-magnetic metal substrate: 0.5mm Set Comprise with: 1 x Digital Colored Thickness Meter 1 x Iron Substrate 1 x Aluminum Substrate 6 x Calibration plates 1 x USB cable & adaptor English Instruction Manual Carrying Case