TSI's CERTIFIER® Air Velocity Calibrator 8392 gives you reliable and convenient in-house calibrations at a reasonable cost. You can have the confidence of high accuracies over a wide velocity range with the CERTIFIER Air Velocity Calibrator. It enables you to calibrate your probed air velocity meters or transducers at velocities as low as 30 ft/min (0.15 m/s) and as high as 9000 ft/min (45 m/s) with typical accuracies of ±1 percent of reading.