Measure visible light levels anywhere with fast, stable and accurate response. Results are easily read on the extra large LCD display (⅞" high, 22mm) that also indicates when the battery is low or the reading over range Light Meter Sper Scientific 840006 Fast, stable and accurate response Measure visible light levels anywhere with fast, stable and accurate response. Results are easily read on the extra large LCD display (⅞" high, 22mm) that also indicates when the battery is low or the reading over range. The color and cosine corrected light sensor meets C.I.E. photopic spectrum. Also features an external zero adjustment, hold function and a tripod back. The Sper Scientific Lux Light Meter comes ready to use with soft padded case and shoulder strap, instructions, detachable sensor with cover, and a 9V battery. N.I.S.T. traceable certificate of calibration available. Meter Dimensions: 8" x 2 ¾" x 1 ¼" (200 x 68 x 30 mm) Weight: 9 oz (280 g) Specifications: Range Resolution Accuracy Light Meter Lux 840006 20,000 lux 1 / 10 lux ±(5% + 4d) 840006 Light meter Lux meter SPER Scientific à¤Ã×èͧÇÑ´áʧ