8.4 LCD touch screen 3D Probes with multi-plane scanning Real-time imaging, Automatical measurement and display its result Result evaluation system Measure Error:?0?V?999ml, Error rate is ±15% Scan depth: at least 14cm With data storing, browsing, exporting and printing function power supply: Built-in battery and AC adapter. Onboard thermo printer Inset offline calibration system 1 year warranty, extended optional No obliged calibration and charges or expiration alarm Measuring steps https://www.linkedin.com/pulse/steps-measure-urine-volume-pbs-bladder-scanner-samuel-teng