The Extech 401025 Foot Candle/Lux Light Meter accurately measures light level. 401025: Foot Candle/Lux Light Meter Includes analog output and fast/slow response feature Features: Accurately displays light level in terms of Fc or Lux over three ranges Select fast (1 second) or slow (2 seconds) response time Analog output of 1mV per count for capturing readings to a recorder Specifications: General Specifications Display 0.5" (13 mm) LCD (Liquid Crystal Display). Measurement Lux Ft-candle (Fc). Ranges Lux: 0 to 50000 Lux 3 ranges. Foot-candle: 0-5000 Fc 3 ranges. Sensor Exclusive photo diode & color correction filter spectrum designed to meet C. I. E. Zero Adj. Manual adjustment. Sampling Time Approx. 0.4 sec. Response Time Fast & Slow selector. Over input indication Indication of "1 " Analog Output 0.1 mV/1 digit max. output 200mV. Operating Temperature 32°F to 122°F 0°C to 50°C Operating Humidity Less than 80% RH. Power Supply 006P DC 9V battery Power Current Approx. 2 mA DC Weight 220 g / 0.52 LB Dimension Main instrument 6.4x2.8x1.2 inch (163x70x30mm). Sensor Probe 3.2x2.2x0.5 inch (85x55x12 mm). Optional Accessories Vinyl pouch carrying case 409996 401025 Extech Light meter Lux meter à¤Ã×èͧÇÑ´¤ÇÒÁà¢éÁáʧ à¤Ã×èͧÇÑ´áʧ