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| Number of batteries contained | 3 pcs. | |
| Type of battery | alkaline-manganese (AlMn) | |
| International size | AA (LR6) | |
| IP index of protection | IP54 | |
| Manufacturer’s designation | testo 440 | |
| Packaging | case | |
| Power supply | battery-powered | |
| Index of protection / protection class | IP degree of protection | |
| Min. measured value, temperature | -20 °C | |
| Min. measured value, relative humidity | -20 °C | |
| Max. measured value, temperature | 70 °C | |
| Max. measured value, relative humidity | 70 °C | |
| Min. measured value, relative humidity | 0 % | |
| Max. measured value, relative humidity | 100 % | |
| Error limit, relative humidity | 2 % | |
| Error limit, relative humidity | 0.5 °C | |
| Error limit, temperature | 0.5 °C | |
| Display resolution | 0.1 °C; 0.1 °C | |
| Type of product | multi-function measuring device | |
| Measurement variables | degrees Celsius | |
| Measuring range for | relative humidity; temperature | |
| Interface | Bluetooth® interface; złącze USB |
| Article number | 474164 FT | |
| EAN / GTIN | 4029547019395 | |
| Manufacturer number | 0563 4404 | |
| Manufacturer/responsible person | Testo SE & Co. KGaA, Celciusstraße 2, 79822 Titisee-Neustadt, Germany, www.testo.de |