Measuring temperature, humidity and velocity, pressure, etc... Testo Multifunction Instruments are the ultimate tool for measurement professionals. The instruments of this series give the user an unmatched selection of different probes. Advanced communication with printers, loggers and PC allow the user to take full advantage of the power of modern data processing, in the convenience of a handheld instrument.

Testo has three different multifunction instruments.

Accurate measurement of Air Velocity, Humidity and Temperature with dew point calculation. An instrument for everyday measuring tasks in air conditioning and IAQ.

• Display indicates 2 measured values simultaneously
• Temperature, Relative Humidity, Air Velocity

The new Reference Class of Multifunction Instruments

It measures the parameters of temperature, CO, CO₂, rpm, mV and mA, % RH, pressure and velocity.

Rapid measurement with accurate temperature probes.

Highest precision due to system calibration (measuring instrument + probe)
Calibration data is saved in the probe.

Calculates all of the physical humidity parameters in the Mollier diagram:
- relativ humidity (% RH)
- dew point, pressure dew point (tp, tdp)
- absolute humidity (g/m₃)
- humidity levels (g/kg pressure-compensated)
- humidity, wet bulbe°C and °F
- water vapour partial pressure in mbar/hPa
- Enthalpy kcal/kg

Humidity probes for nearly every application

Guaranteed long-term stability

Highest accuarcy ± 1 %

m/s module, mbar: All of the conventional types of averaging are available

Volume flow measurement (m³/h, m³/min, l/s)

Duct cross-sections in the various measurement locations can be saved in the instrument. When the
measurement location is called up the saved cross-section can be used to measure m³/h.

Measures the barometric pressure (absolute pressure) as a reference value or for the correct Pitot tube measurement.

Measures turbulence levels.

The IAQ master data acquisition system with 6 freely assignable measurement inputs. The 454 is two instruments
in one. A measuring instrument for spot checking measurements and data logger for long-term monotoring.

• Six freely assignable probe connections ; 18 channels possible
• measures and records Temperature, Relative Humidity, Air Velocity and Differential pressure
• easily programed via Keypad or PC