HYDROLOGY METERS

YSI FP111 | Handheld digital water-velocity meter for open channels and partially filled pipes. Features a protected Turbo-Prop sensor (0.1–6.1 m/s), true running average at 1 Hz, 3.7–6 ft anodized-aluminum telescoping handle, stores 30 readings, and a 5-year internal lithium battery.
YSI FP211 | Same high-accuracy Turbo-Prop sensor and data-logging functions as the FP111, with an extended 5.5–14 ft telescoping handle for deeper or wider flows. Lightweight (3 lb) and rated for 30 stored data sets and 5 years’ battery life.
YSI FP311 | Compact variant with 2.5–5.5 ft handle for confined spaces or shallow flows. Delivers the same 0.1 FPS accuracy, 1 Hz averaging, 30-point memory, and 5-year battery life in a 2.8 lb package.