BK8630 Digital 3 1/2 LCD Light Meter Features: 1)CE-Mark approval 2)Portability and simplicity one-hand operation 3)Accurate visible compensation filter 1 is used 4)CIE(ë): 1<2%, <3%, <5%, <8%, V(ë) match 5)Cosine corrected: 2<2% 6)Signal output function (output impedance 500Ù) 7)With MAX/DATA HOLD function 8)Valox housing to withstand accidental drops 9)Attached carrying case   Applications: 1)Indoor    2)Office environment 3)Labs      4)Environment studies Specifications: Display: 3½ digit liquid crystal display (LCD) with a maximum reading of 1999. Low battery indication: The " " is displayed when the battery voltage drops below the operating level. Operating environment: 0°C to 50°C, <70% R.H.. Storage environment: -20°C to 60°C, 0 to 80% R.H. with battery removed from meter. Accuracy: Stated accuracy at 23°C±5°C, <75% R.H.. Dimensions: 170mm(H) x 44mm(W) x 40mm(D). Weight: Approx. 220g including battery (1.5Vx4pcs AAA size). Lux: Sensor: Silicon photodiode Range: 20lux, 200lux, 2000lux, 20000Klux, 200000lux Resolution: 0.01lux Accuracy:       MODEL    8630-2    8630-3    8630-5    8630-8    8630        Spectral Response    CIE Photopic    CIE Photopic    CIE Photopic    CIE Photopic    White Light        Spectral Accuracy    f 1<2%    f 1 <3%    f 1 <5%    f 1 <8%    NO spec.        Cosine Response    f 2<2%    f 2<2%    f 2<2%    f 2  <2%    f 2<2%        Total Accuracy For All Common Light Source    ±(5%+2)    ±(6%+2)    ±(8%+2)    ±(11%+2)    NO spec        Total Accuracy For Source A 2856K Standard Light Source    ±(3%+10)    ±(3%+10)    ±(3%+10)    ±(3%+10)    ±(3%+10)