ATP-Pocket-Vane-Anemometer-AVM-81AM-ATP-AVM-81AM-P-This-pocket-sized-anemometer-from-ATP-has-a-lightweight-low-friction-ball-vane-providing-high-accuracy-at-high-&-low-air-velocity-This-pocket-Vane-Anemometer-is-ideal-for-use-on-the-go-P-P-The-robust-case-incorporates-a-large-easy-to-read-display-&-wrist-strap-making-them-ideal-for-practically-all-conditions-&-uses-As-well-as-all-this-the-unit-features-a-handy-data-hold-function-which-freezes-the-unit-at-the-current-measurement-