Check the listing for details. Lux Meter Light Visible Light Tester Illumination Intensity Tester 0.01-39990Lux. Condition: New. Listed at 105.00 USD. 1. Maximum display value: 39992. Measuring range: 39.99, 399.9, 3999, 399903. Accuracy: ± 4% + 5 (in the case of 2856K standard light source)4. V (λ) matching error: ƒ’1≤6%5. Maximum resolution: 0.01 Lux6. Sensor: silicon photodiode and visual correction filter7. Repetitive accuracy: ± 2%8. Sampling rate: 2 times/sec9. Operating temperature and humidity: 0℃ - 40℃ (32℉ - 104℉) 0 - 70% RH10. Storage temperature and humidity: -10℃ - 50℃ (14℉ - 122℉) 0 - 80% RH11. Working power: single 6F22 9V battery12. Service life of battery: about 200 hours of continuous use13. Meter size: host 160 x 78 x 43 mmProbe φ40 x 35 mm and 1000 mm shielding extension line14. Meter weight: about 370 g (including battery and probe)15. Deviation characteristic of cosine angle: 30° ± 2%; 60° ± 6%; 80° ± 25% Product Features 1. Resolution up to 0.01 Lux makes it possible for detecting dim light and weak light.2. Low-level V (λ) matching error (ƒ’1≤6%) complies with the CNS 5119 Class Ⅱ standard.3. It has a wide measuring range of 0.01 Lux to 39990 Lux.4. It is capable of peak holding and data retention. The meter is a precise instrument for measuring visible light emitted from fluorescent lamp, metal halide lamp, high-pressure sodium lamp or incandescent lamp, LED lamp, and the like.Illuminance is a unit of illumination intensity. It represents luminous flux per unit area in physics -- lumens per square meter (Lm/m2), also known as Lux (1 Lux = 1 Lm/m2), wherein Lm is the unit of luminous flux, and Lux is the unit of illuminance.