Highly sensitive and accurate screw gauge that also incorporates digital scale along with the micrometer. Well painted hardened steel body with stainless steel ratchet LCD display with functions including measurement in both mm and inches, tolerance setting, data hold, relative / absolute measurement. Positive / negative setting and origin resettin g , auto power off. Digital scale range 0-1″ x 0.00005″ or 0-25 x 0.001 mm with accuracy of 0.002mm. Micrometer 0-25 x 0.01 mm. With ratchet lock. Operates on silver-oxide button cell- SR44 (1. 55V), cell included. Supplied in a nice foam lined, plastic case. Also includes spanner for removal of battery lid.