- Light Source: tungsten lamps with narrow-band interference filters
- Light Detector: silicon photocell
- Power Supply: external 12 VDC power adapter or built-in rechargeable battery
- Auto-off: after 10 min. of non-use in measuring mode; after 1 hour of non-use in calibration mode with last reading reminder
- Environment: 0 to 50°C (32 to 122°F); RH max 90% non-condensing
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