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| OS643 °C/°F Switchable Detection Element: Thermopile Sighting: Laser Marker 1 mW Backlit LCD Display Analogue Output: 1 mV/°C/°F Emissivity: 0.95, Accuracy ± 3% Temperature Range: 0 to 260°C (32 to 500°F ) | 
| OS643E Infrared Thermometer    °C/°F Switchable Detection Element: Thermopile Sighting: Laser marker 1 mW Backlit LCD Display Emissivity: Adjustable 0.01 to 1.00 Temperature Range: -20 to 400°C, -4 to 752°F | 
| OS643 | OS643E | |
| Backlit LCD | Yes | Yes | 
| Resolution (counts) | 1999 | 1999 | 
| Laser guide (1mW) | No | No | 
| Emissivity (E) | 0.95 | Adjustable 0.01 to 1.00 | 
| Range C° | 0 to 260 | -20 to 400 | 
| Range F° | 32 to 500 | -4 to 752 | 
| Auto hold | Yes | Yes | 
| Analogue Output | Yes | No | 
| Auto-power off | Yes | Yes |