Brandt Instruments distributing TSI Air Velocity Meters, Ventilation Meters, IAQ Meters, Micromanometers & Thermohygrometers
Environmental Monitoring & Industrial Hygiene Instrumentation
Brandt Instruments Distributing TSI 
VelociCalc® Digital Air Velocity Meters


TSI VELOCICALC Air Velocity Meters 9515,9525,9535,9545

VelociCalc® Digital Air Velocity Meters
Models 9515, 9535, 9545

Replace Models 8330, 8340, 8345, 8346, 8347/8384


VelociCalc® Air Velocity Meters

VelociCalc air velocity meters are ideal tools for measuring face velocity measurements in fume hoods and spray booths or for IAQ and ventilation system checks.

The Models 9515 is an economical choices for Air Velocity Meters without compromising accuracy or precision. The Model 9515 features a 40-inch (101.6 cm) telescoping integrated probe for difficult to reach measurements.

The Models 9535 and 9545 thermal anemometers are like having multiple instruments for the price of just one. These meters simultaneously measure and data log several ventilation parameters using a single probe with multiple sensors. Both models measure velocity, temperature and calculate flow. The Model 9545 also measures relative humidity, and calculates dew point, and wet bulb temperature. Models 9535 and 9545 have telescopic straight probes; Models 9535-A and 9545-A have telescopic articulated probes.

Features and Benefits
  • Simple to operate
  • Accurate air velocity measurement
  • Integrated probe attachment
  • Calibration certificate included


  • Model 9515
    • Model 9515 range 0 to 4,000 ft/min (0 to 20 m/s)

  • Models 9535 and 9545
    • Simultaneously measure velocity and temperature
    • Calculates volumetric flow and actual/standard velocity
    • Measures humidity (Models 9545 and 9545-A)
    • Displays up to 3 measurements simultaneously
    • LogDat2™ downloading software included
    • Articulated probe versions available (9535-A and 9545-A)
  • HVAC system performance
  • Commissioning
  • Plant maintenance
  • Critical environment certification

TSI 9545 VelociCalc air velocity meter

Model Comparison Matrix 9515, 9535, 9545

  9515 9535
Velocity x x x
Temperature x x x
Flow   x x
Humidity, wet bulb, dew point   x
Probe Telescoping Straight or
Straight or
Variable time constant   x x
Manual data logging   x x
Auto save data logging   x x
Statistics   x x
Review data   x x
LogDat2 downloading software   x x
Intrinsically Safe
Free Certificate of Calibration x x x


  Range 9515 0 to 2000 ft/min (0 to 10.00 m/s)
  9535, 9545 0 to 6,000 ft/min (0 to 30 m/s)
  Accuracy1, 2 9515 ±5% of reading or ±5 ft/min (±0.025 m/s), whichever is greater
9535, 9545 ±3% of reading or ±3 ft/min (±0.015 m/s), whichever is greater
  Resolution 1 ft/min (0.01 m/s)
Flow Measurement - max duct size 9535, 9545 1 to 250 inches in increments of 0.1 in.
(1 to 635 cm in increments of 0.1 cm)
  Range 9515 0 to 200°F (-18 to 93°C)
9535 0 to 200 °F (-17.8 to 93.3°C)
9545 14 to 140°F (-10 to 60°C)
  Accuracy3 9515, 9535, 9545 ±0.5°F ( ±0.3°C)
  Resolution 9515, 9535, 9545 0.1°F (0.1°C)
Relative Humidity (9545 only)
  Range 0 to 95% RH
  Accuracy ±3% RH
  Resolution 0.1% RH
Instrument Temperature Range
  Operating Temperature Range Electronics 40 to 113°F (5 to 45°C)
  Probe 9515 0 to 200°F (-18 to 93°C)
9535 0 to 200°F (-18 to 93°C)
9545 14 to 140°F (-10 to 60°C)
  Storage -4 to 140°F (-20 to 60°C)
Data Storage Capabilities 9535, 9545 12,700+ samples and 100 test IDs
Logging Interval 9535, 9545 1 second to 1 hour
Time constant 9535, 9545 User selectable
External Meter Dimensions 3.3 in. x 7.0 in. x 1.8 in. (8.4 cm x 17.8 cm x 4.4 cm)
Probe Dimensions 9515, 9535, 9545 Length 40 in. (101.6 cm)
Diameter - tip 0.28 in. (7 mm)
Diameter - base 0.51 in. (13 mm)
Articulating Probe 9535-A, 9545-A Length of Articulated Section 6.4 in. (16.26 cm)
Diameter of Articulating Knuckle 0.38 in. (9.5 mm)
Meter Weight with Batteries 9.6 oz. (270 g)
Power Requirements Four AA-size batteries or AC adapter
1 Temperature compensated over an air temperature range of 40 to 150°F (5 to 65°C).
2 The accuracy statement begins at 30 ft/min through 6,000 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.
4 Accuracy with probe at 77°F (25°C). Add uncertainty of 0.1% RH/°F (0.2% RH/°C) for change in probe temperature. Includes 1% hysteresis.
Specifications are subject to change without notice.

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