"USED TO MEASURE UNIFORMLY RADIATING SURFACES SUCH AS BACKLIT PANELS, FILM VIEWERS AND MONITORS. MEASURES BRIGHTNESS OF VISIBLE LIGHT SOURCE AND ALOWS CHOICE OF DISPLAYING IN THREE DISTINCT UNITS OF MEASURE CANDELAS PER SQUARE METER, CANCELAS PER SQUARE FOOT AND FOOTLAMBEITS. MEETS ASTM AND MIL STANDARDS, IDEAL FOR RADIOGRAPHIC EXAMINATIONS REQUIRING FILM VIEWER OUTPUT EASUREMENTS. EASY CONNECTION WITH USB CABLE FOR DIGITAL READ OUT."