Rugged impact resistant composite material. Easy to read SAE and metric LCD display. Low battery warning with 12 month average battery life. Includes 1.5 volt button cell battery. Specifications: accuracy +/- .001 inch (.2 millimeter). Resolution: 0.0005 inch/0.01 millimeter. Throat depth: 1-9/16 inch. Temperature operating range: 32 degree Fahrenheit to 104 degree Fahrenheit. Overall length: 9-1/2 inch.