The Dwyer 480 Vaneometer™ Swing Vane Anemometer is a durable low-priced instrument specifically designed to simplify the measurement of low air velocities from 25 to 400 feet per minute. OSHA, EPA and other safety ventilation requirements for spray booths and at fume, smoke and dust exhaust hoods can now be quickly checked, even by untrained personnel. Its small size and light weight --- only four ounces make it ideal to carry from one work station to another. A versatile steel mounting bracket for continuous monitoring is also included. The Vanemometer™ Swing Vane Anemometer is accurate to ¬±5% of full scale to 100 FPM and 10% from 100 FPM to top of scale. It has a spirit level to insure accurate readings and the large scales are easy to read and visible from both sides.