PROFESSIONAL HOT WIRE THERMO ANEMOMETER
DIGITAL ANEMOMETER WITH DATA LOGGER AND EXTENDABLE PROBE

The Hot Wire digital thermo anemometer is an advanced device designed for accurate measurement of air speed, airflow, and temperature. Thanks to the thermal probe, the meter detects even very small air movements, providing high measurement precision.

The GM8903 model features an extendable, flexible measuring probe with adjustable length from 30 cm to 1 m, making it much easier to work in hard-to-reach places such as ventilation ducts, device housings, or HVAC systems.

The device can be connected to a computer via a USB interface, enabling detailed analysis and archiving of measurement results. The built-in internal memory stores up to 500 measurements.

MAIN FEATURES

• measurement of air speed, airflow, and air temperature

• very high sensitivity thanks to Hot Wire technology

• unit conversion for speed, temperature, and airflow

• max, min, and average measurement

• calculation of 2/3 of the maximum airflow value

• HOLD, data save, and data delete functions

• internal memory for 500 records

• clear backlit LCD display

• low battery indication

• auto power-off after 10 minutes of inactivity
  (disabled when powered via USB)

• USB communication with a computer

• key beep sound

• ergonomic and solid design

In the latest version, a rubber protective cover for the probe is used, which better protects the measuring tip during transport and use.

TECHNICAL PARAMETERS
Air speed:

• m/s: 0.0 – 30.0 | resolution 0.001 | start threshold 0.05 | accuracy ±3% ±0.1

• ft/min: 0 – 5860 | resolution 0.01 / 0.1 / 1 | threshold 10 | accuracy ±3% ±2.0

• knots (kn): 0.0 – 55.0 | resolution 0.01 | threshold 0.1 | accuracy ±3% ±0.2

• km/h: 0.0 – 90.0 | resolution 0.001 | threshold 1.0 | accuracy ±3% ±0.4

• mph: 0.0 – 65 | resolution 0.001 / 0.01 | threshold 0.2 | accuracy ±3% ±0.2

Airflow:

• CMM / CFM: 0 – 999,900

• resolution: 0.001 – 100

• area: 0.001 – 9999

Air temperature:

• °C: 0.0 – 45.0 | resolution 0.1 | accuracy ±1.0°C

• °F: 32.0 – 113.0 | resolution 0.1 | accuracy ±1.8°F

Operating conditions:

• main unit: 0 – 50°C | humidity ≤80% RH

• probe: 0 – 60°C | humidity ≤80% RH

Power and general data:

• power supply: 4 × AAA 1.5 V batteries

• low voltage indicator: 4 V ±0.2 V

• standby current consumption: 0 µA

• working current: ≤60 mA

• battery life: up to 20 hours

• net weight: 330 g (without batteries)

Dimensions:

• main unit: 77 × 36 × 164 mm

• probe: 30.5 × 30.5 × 305 mm (extendable up to 1000 mm)

• measuring head diameter: 10 mm

• max probe diameter: 13 mm

APPLICATIONS
The thermo anemometer is suitable for:

• measurements in ventilation and air conditioning systems

• airflow control in ducts and air inlets

• diagnostics of cooling systems and fans

• industrial and research applications

• HVAC service and maintenance

Device parts

1. Probe cable connector
2. LCD display
3. Power on/off
4. Data hold
5. Unit change
6. Display backlight
7. Saved data recall
8. Average airflow measurement
9. Reset in recall mode / clear saved data
10. Duct cross-section and sampling time input
11. 2/3V max, average, and outlet data input
12. Data saving
13. Temperature unit change
14. Speed/flow measurement function switch
15. Max/min value switch
16. Probe connecting cable
17. Measuring probe

Display elements

1. Airflow symbol
2. No saved data symbol
3. Dynamic bar graph for airflow and air speed
4. Duct cross-section input symbol
5. Multiplier factor
6. Air speed/airflow value
7. Temperature value / duct cross-section value
8. Low battery indicator
9. Duct cross-section shown in square feet for airflow. Temperature indicator in °F.
10. Duct cross-section shown in square centimeters for airflow. Temperature indicator in °C.
11. Measurement unit – CMM (cubic meters per minute)
12. Measurement unit – CFM (cubic feet per minute)
13. Measurement unit – mph (miles per hour)
14. Measurement unit – knots (nautical miles per hour)
15. Measurement unit – ft/min (feet per minute)
16. Measurement unit – km/h (kilometers per hour)
17. Measurement unit – m/s (meters per second)
18. Data hold
19. Wind chill indicator
20. Data sampling frequency
21. Computer connection symbol
22. Airflow speed symbol
23. Sequential record number
24. Saved data recall
25. 2/3 maximum value measurement
26. Minimum measurement value
27. Average measurement value

Set includes

• anemometer

• extendable measuring probe

• 4× 1.5V AAA alkaline batteries

• CD with software

• USB cable

• printed user manual in Polish, plus a downloadable manual

• fabric case

BENETECH is a manufacturer of professional measuring and control instruments.

All products meet high quality standards and undergo full inspection before shipment. As a result, BENETECH products are in high demand and are regarded as reliable and high quality, while still being offered at an affordable price.