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TSI® Air Velocity/Temperature Meter, VelociCalc® w/ NIST Certification - Articulating Probe

(Download Manual)


The VelociCalc Air Velocity/Temperature Meter is a cost effective solution for measuring air velocity, flow and temperature, as it combines the capabilities of three instruments in one compact unit. This meter simultaneously measures and data logs several ventilation parameters using a single telescopic articulating probe with multiple sensors. The Air Velocity/Temperature Meter also comes with a NIST Certificate of calibration to ensure accuracy.




Specifications are subject to change without notice.


Range: 0 to 6000 ft/min (0 to 30 m/s)

Accuracy1&2: ±3% of reading or ±3 ft/min (±0.015 m/s), whichever is greater

Resolution: 1 ft/min (0.01 m/s)

Duct Size:

Range: 1 to 250 inches in increments of 0.1 in. (1 to 635 cm in increments of 0.1 cm)

Volumetric Flowrate:

Range: Actual range is a function of actual velocity, pressure, duct size, and K factor


Range: 0 to 200°F (-18 to 93°C)

Accuracy3: ±0.5°F (±0.3°C)

Resolution: 0.1°F (0.1°C)

Instrument Temperature Range:

Operating (Electronics): 40 to 113°F (5 to 45°C)

Operating (Probe): 0 to 200°F (-18 to 93°C)

Storage: -4 to 140°F (-20 to 60°C)

Instrument Operating Conditions:

Altitude up to 4000 meters

Relative humidity up to 80% RH, non-condensing

Pollution degree 1 in accordance with IEC 664

Transient over voltage category II

Data Storage Capabilities:

Range: 12,700+ samples and 100 test IDs (one sample can contain fourteen measurement types)

Time Constant:


Response Time:

Velocity: 200 msec

Temperature: 2 minutes (to 66% of final value)

External Meter Dimensions:

3.3 in. - 7.0 in. - 1.8 in. (8.4 cm - 17.8 cm - 4.4 cm)

Meter Probe Dimensions:

Probe length: 40 in. (101.6 cm)

Probe diameter of tip: 0.28 in. (7.0 mm)

Probe diameter of base: 0.51 in. (13.0 mm)

Articulating Probe Dimensions:

Articulating section length: 7.8 in. (19.7 cm)

Diameter of articulating knuckle: 0.38 in. (9.5 mm)

Meter Weight:

Weight with batteries: 0.6 lbs (0.27 kg)

Power Requirements:

Four AA-size batteries (included) or AC adapter (optional) 9 VDC, 300 mA,

4-18 watts (input voltage and frequency vary depending on which adapter is


1. Temperature compensated over an air temperature range of 40 to 150°F (5 to 65°C).

2. The accuracy statement of ±3.0% of reading or ±3 ft/min (±0.015 m/s), whichever is greater, begins at 30 ft/min through 6000 ft/min (0.15 m/s through 30 m/s).

3. Accuracy with instrument case at 77°F (25°C), add uncertainty of 0.05°F/°F (0.03°C/°C) for change in instrument temperature.

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