The metal used to manufacture Mitutoyo 0-200mm Absolute Digimatic Depth Gauge is a hardened steel alloy. The 0-200 mm Absolute Digimatic Depth Gauge has a battery that lasts for 20,000 hours or approximately three years. The Digimatic Depth Gauge consists of lithium-ion batteries that enable fast charging time. The Gauge has an LCD for easy and quick readings of the measurements. The depth gauge measures the holes, recesses, and slots precisely, and an extended rod enables deep measurement. The Mitutoyo 0-200mm Absolute Digimatic Depth Gauge is tested for accuracy, making it highly reliable for industrial usage. The sturdy material of the scale makes it resistant to damage caused by repeated rough use. Product Attributes: Accuracy: ±0.02 mm Battery: SR44 Brand: Mitutoyo Display: LCD Length standard: Absolute electrostatic capacitance type linear encoder Mass: 212 g Model: 571-202-30 Product: Digimatic Depth Gauge Range: 0-200 mm Resolution: 0.01 mm