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| Senser | (optical) 500 mm | 
| Contact measurement | 1 to 19999 revolutions/minute (Fluke 931 only) | 
| Optical (non-contact) measurement | 1 to 99999 revolutions/minute | 
| Battery Life | About 40 hours | 
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                | Senser | (optical) 500 mm | 
| Contact measurement | 1 to 19999 revolutions/minute (Fluke 931 only) | 
| Optical (non-contact) measurement | 1 to 99999 revolutions/minute | 
| Battery Life | About 40 hours | 
| Display | Digital | 
| Battery Type | (2) 1.5V LR6 (alkaline) AA battery | 
| Operating Temperature | 0°C to 50°C | 
| Type of Product | Digital Tachometer | 
| Weight | 250 g | 
| Precision | ±0.02%RD+1 | 
| Dimension | 175 × 60 × 28 mm | 
| Model No | FLUKE-931 ESP | 
| Contact Type | Contact and Non-Contact |