Info-electronics Systems India Pvt. Ltd. Supplies Handheld Acoustic Doppler Velocimeter - ADV. Info-electronics Systems India Pvt. Ltd. Offers hydrometeorology, meteorology and oceanography instruments. Handheld Acoustic Doppler Velocimeter - ADV is a compact package for accurate, high-precision water velocity measurements in natural streams, weirs / flumes, and open channels related to irrigation, storm water, water treatment, and mining. Handheld Acoustic Doppler Velocimeter - ADV can easily attaches to top-setting wading rods. It is provided with the feature of an automatic discharge computation program. Its model name is FlowTracker.