Omnidirectional probe tip Available with choice of 3, 6, 9 or 12 inch probes Accurate at low velocities from 10 to 100 ft/min (0.05 to 0.5 m/s) Ideal for unknown or varying flow direction > Each Unit Includes Probe attached to 16.4-ft (5-m) cable connected to control module Protective sleeve Compression fittings for mounting in duct work Two holding clips to mount probe to parallel surface Operation and service manual NIST calibration certificate Two-year limited warranty