Note: no battery include in shipping due to airport shipping rules Internal and external dimensions can be easily and accurately measured Linear capacitive measuring system Zero setting in any position With a small locking thumb screw which locks the jaws in place Base measuring function: Inside, outside With easy to read large LCD display Resolution: 0.1mm/0.01inch Accuracy: ±0.2mm size:245 x 80 x 12mm power:AG13 1.5V cell battery(Battery NOT Included) weight:53g Package include: 1x100mmDigitalPlastic Caliper(Battery NOT Included) OR 1x150mmBlack DigitalPlastic Caliper(Battery NO TIncluded)