XAR-UL is a precise meter that measures ultraviolet UVA and UVB radiation and illuminance (lux, footcandle) simultaneously in the field. XAR-UL has two types of sensors. One is UVA+B sensor, and another is illuminance photo sensor. UVA+B sensor is a Schottky photodiode based on gallium nitride material to detect UVA and UVB radiation. It has the characteristics of high sensitivity and high stability. The illuminance photo sensor is meet CIE (International Commission on Illumination) photopic spectral response. Applications of UVA+UVB radiation measurement: Testing window film / tint transmission. Monitoring low level UV from household lamps. Testing ground level UV from stadium lighting. Testing ground level UV from stage, nightclub and theater lighting. Monitoring artwork UV exposure. Monitoring archaeological UV exposure. Measuring outdoor UV including shady area UV. Monitoring UVA lamp intensity and aging. Testing UVA in industrial glue curing, tungsten ore identification, fluorescence detection, biopolymerization, oil pollution detection, ore exploration, criminal detective, and textile industry. etc.. Applications of illuminance measurement: R&D at light products manufacturers. Inspection of light sources at construction sites, government, educational facilities, stage, nightclub and theater etc.. Maintenance of lights in factories, offices, and hospitals. Agricultural and forestry industries. etc. UV Specification: UVA+UVB Measurement Range0 to 35000 µW/cm² (35 mW/cm²); Spectral Detection Range240 to 370 nm; Peak point352 nm; Measurement accuracy±4% or ±1 digits; Resolution1.0 µW/cm2; Illuminance Specification: Measuring Range0 to 188,000 lux, 0 to 17,472 fc; Spectral ResponseCIE Photopic; Accuracy±5% reading, ±1 digit (<10,000Lux); ±10% reading, ±10 digit (>10,000Lux); Repeatability±3%; Photo DetectorOne silicon photo diode and spectral response filter. Power SupplyFour AA Alkaline Batteries； Dimensions75x165x25 mm (2.95x6.49x0.98")； Weight 4.52 oz.