Specifications include, but are not limited to: 1. The Handheld Display unit with an IP67 waterproof rating and a color LCD display. 2. Keypad interface. 3. SmartQC quality control feature. 4. 16GB internal memory. 5. Bluetooth communications. 6. Internal GPS. 7. USB interface and cable. 8. Removable battery cartridge plus spare cartridge, 8 AA alkaline batteries. 9. Multi-language support. 10. Windows based software for communications, recorder downloading, data processing and data export. 11. Probe assembly consisting of a 2D side-looking 10 MHz Acoustic Doppler Velocimeter (ADV) probe (10-cm distance to sampling volume) and signal conditioning/processing electronics with tilt sensor and Auto-velocity Range selection, mounted on a 1.5-m cable with a compact 8-pin male wet-pluggable connector, OR equivalent. 12. Two (2) piece top-setting wading rod, 4-ft, English increments in tenths of feet; includes bubble level, mounting brackets for Handheld Display unit and ADV Sensor. 13. Plastic shipping case for both wading rod, Handheld Display and ADV Sensor. 14. Three (3) additional battery holders, 8AA cells (square end). 15. User manual in PDF format.