ATG Palm Bladder Scan V5.1 is the latest version of the Commercial Grade Palm Bladder Scan PBSV4.1 with superior accuracy of measurement of the bladder volume. It is rugged and withstand the test of time with proprietary stand for added durability. The Probe is drop proof and designed to last. It has an added lithium ion extra battery with a separate battery charger and a plug in battery charger for uninterrupted function.