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| Model | AURORA 90 III |
| Clock | Quartz type "C" size battery x 2 Battery life: about 1 year in continuous use |
| Recording period | one month or three months |
| Sensors | Aged bimetal strip for temperature Human hair bundle for relative humidity |
| Measuring range | -20 to 50°C for temperature 0 to 100% for R. humidity |
| Accuracy | ±1°C (at 10 to 30°C) for temperature ±2°C (at other than above) for temperature ±3% (at 15 to 25°C, 20 to 95%) for R. humidity ±5% (at other than above) for R. humidity |
| Chart graduation | 1°C for temperature 1% for R. humidity |
| Chart speed | 3.2 mm/hour, 2 hours/min. graduation |
| Chart width | 174 mm (effective width : 156 mm) |
| Recording pens | Cartridge pens (violet) |
| Dimensions | (W)336 x (H)295 x (D)148 mm |
| Weight | approx. 3.8 kg |