BENETECH GT1011 Digital Lux Meter Industrial Lighting Measuring 1. Lux meter is a professional instrument for measuring light intensity and brightness. It is used for light intensity measurement engineering, quality control, health prevention, and measurement of light intensity in various environments, such as factories, schools, offices, traffic routes, homes, etc. 2. Main components: photodiode + cosine corrector + correction filter 3. Temperature probe: NTC thermistor 4. Illumination range: Total range: 0 to 200,000 Lux, Three ranges: 0 to 999.9 Lux 1000 to 9999 Lux 10000 to 200000 Lux 5. Temperature range: -9.9 to 49.9 degrees Celsius 6. Illumination accuracy: less than 10000 Lux: +-3% rdg, greater than 10000 Lux: +-4% rdg 7. Temperature accuracy: +-2.0 degrees Celsius 8. Instrument operating temperature and humidity: 0 to 40 degrees Celsius, 10 to 90% RH 9. Instrument storage temperature and humidity: -10 to 50 degrees Celsius, 10 to 90% RH 10. LCD screen update: 2 times per second 11. Power supply: 3 x 1.5V AAA batteries (not included) 12. Support unit conversion, data retention, HD backlight 13. With maximum and minimum value measurement, automatic shutdown function