Use the Vaneometer swing vane anemometer to measure velocity of air flow into laboratory fume hoods and at paint booths to determine when to change filters. Or wherever needed to meet standards of ventilation for smoke, dust or fume removal. The 480 Vaneometer Swing Vane Anemometer is a , economically priced instrument specifically designed to simplify the measurement of low-velocity air moving hosizintally. It is accurate to ±5% of full-scale to 100 FPM and ±10% from 100 FPM to the top of scale. It has a spirit level to accurate readings. Large numerical scales on both sides are easy to read. Small size and weight make for easy portability. Easy-to-clean ABS plastic housing. Measure horizintal air flow from 25 to 400 ft/min. Color:Black Material:plastic Package Contents: 6 * Thermistor Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.