Item # 0560 4170, testo 417 Large Vane Anemometer (4" Dia. Head)

The high quality bearings in the testo 417 yield nearly "friction-free" rotation for direct measurement of air velocity with an NTC sensor used to determine air tempeature. The vanes cover all the measured area - no airflow is lost between the vane and outer ring. The 4" head averages true flow over its entire area, not just responding to local stray eddies. Just input the duct cross-sectional area (from 0.2 sq. in. to over 100 sq. ft.) to see accurate, real-time CFM calculations. Simply toggle betweem velocity, CFM, and temperature readings on the clear, backlit display. Flow direction is indicated by an arrow in the display. timed or multi-point averages are easlily accomplished with all parameters and caluclations. Mn-Max values can also be displayed. The "Hold" function frezes current readings in the display making data recording easy.

• Real-time or average CFM, velocity, temperature
• True velocity measurement - no air density correction required
• Simple one hand operation
• Easy to carry and operate
• Adjustable A(K) factor (open area of grille)
• Required for proper systems commissioning
• Long battery life
• Built-in Ø 3.93 in. vane