This is a useful device for anyone who wants to measure illumination levels. It senses or detects brightness/lux of any environment. It uses long life silicon diode, spectral response filter and fully corrected for the angular incidence of light to ensure stability. Brightness or light intensity plays a very essential factor in determining the proper exposure for photograph as well as providing correct light intensity for each environment. It reads the intensity of light falling on the subject and measurements are taken from the subject position It has the approval of European Directives for essential health standards and safety requirements, you are assured that using this item is safe. The data gathered are very useful information in maintaining the correct brightness of any environment applications like in the fields of cinematography, in scenic design, in determining optimum light level for a scene, in the general field of lighting, in reducing the amount of waste light used in the home, in ensuring proper light levels for plant growth. And even in measuring luminance in any environments such as illumination control, weather observation and work places like factories, offices, shops, schools, restaurants, beauty salons, electro-optical sources, research teaching, metallurgy building, industry inspection, agriculture research and many other environments. QUALITY * Corrected for Luminous Efficiency function * Correction factor need not be manually calculated for nonstandard light sources * With LSI-Circuit to provide high reliability and durability * With long life silicon photo diode inside * Powered by a 9v battery at no extra cost and typical battery life last for about 200 hours (if alkaline battery is used) SPECIAL FEATURES * Data hold function * CE marking, with approval from the European Directives * With built-in Low battery indication * Separate Light Sensor allows user take measurements at an optimum position and convenient testing * Auto-Range and Auto Zero-Adjustment * Easy to read, clear & big 4 digits LCD display – in all light conditions * With built-in Low battery indication * High accuracy in measuring * Low in power consumption which gives you more operating hours * Light and portable * Comes with instruction manual and sturdy carrying case with contoured form inside absorbs maximum shock impact SPECIFICATIONS * Range Coverage is from 0~100, 000 LUX (3 ranges) * Ranges: 0 - 2,000 LUX *2,001 - 20,000 LUX (Reading× 10) *20,001 - 100,000 LUX (Reading× 100) * Accuracy: *0 ~ 10,000 * Lux: ±4.0% ±0.5 F.S *10,000~100,000 *Lux: ±5.0% + 10 digits * Temperature Characteristic :* ±0.1% / °C * Repeatablity : ±2% * Test rate : 0.2 times / sec. * One silicon photo diode with filter * Operation temperature-humidity : 0°C to 40°C (32°F-104°F) 0-70% RH * Storage temperature-humidity: -10°C to 50°C (14°F-122°F) 0-80% RH * Over-input : * Indication of " 1" (2,000 Lux/20,000 Lux) * Indication of "OVER" (100,000 Lux) * Dimension: * 106 x 57 x 26mm (photo detector) * 230x72x30mm (meter body) * 150cm (photo detector lead) * Power: 9V (6F22) x1 * Case color: Black * Weight: 190g