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Data Sheet | Instruction Manual
Testo 645 Professional Dual-Channel Humidity and Temperature Instrument
The Testo 645 high-precision humidity and temperature measuring instrument is an advanced, industrial-grade engineering tool designed for highly detailed thermodynamic evaluation and indoor climate diagnostics. Outfitted with two specialized probe inputs, the multichannel architecture connects to a premium portfolio of interchangeable Pt100, NTC, and Thermocouple (Types K, J, S) sensors. At the touch of a button, it automatically calculates and processes vital air characteristics including relative humidity, absolute humidity, dew point, pressure dew point, degree of humidity, and enthalpy. Featuring an internal memory block that safely registers up to 3,000 measurements, this industrial thermohygrometer delivers stable, legal compliance monitoring data across environmental logistics and industrial processing plants.
Industrial & Trades Applications
- Facility Microclimate & Server Room Auditing: Continuous high-precision monitoring of relative humidity and heat thresholds inside critical server farms, laboratories, storage centers, and archives.
- Structural Damage Diagnostics: Strategic positioning of surface and air probes to calculate condensation parameters and locate moisture risks or mould formation zones in industrial complexes.
- Compressed Air & Logistics Quality Control: Accurate measurement of pressure dew points and enthalpy variations within technical production processes and logistics containers.
Technical Characteristics
| Sensor Connectivity Interface | 2-channel input matrix: Channel 1 for TC Type K/J/S and NTC; Channel 2 for Humidity/Temperature or Pt100 sensors |
| Pt100 Temperature Range | -200 to +800 °C |
| NTC Temperature Range | -50 to +150 °C |
| Thermocouple Type K Spectrum | Broad industrial reach from -200 up to +1370 °C |
| Capacitive Humidity Matrix | 0 to 100 %RH measurement span; 0.1 %RH high-resolution scaling |
| Pt100 Core Instrument Accuracy | ±0.2 °C (-200 to 200 °C); ±0.1% of measured value (200.1 to 800 °C) |
| Thermocouple Type K Accuracy | ±0.3 °C (-60 to +60 °C); ±0.5% of measured value for the remaining scaling |
| Internal Reading Buffer | Integrated volatile microchip memory storing up to 3,000 engineering readings |
| Hardware Frame Housing | Ruggedized ABS polymer shell; 4-line digital LCD display; weight 255 g |
| Power Supply System | 9V block battery delivering up to 45 hours of independent outfield operation |
Package Contents
- Testo 645 dual-channel professional humidity and temperature meter
- 9V technical block battery module
- Official factory calibration protocol validation verification documents