The Knightsbridge lux meter has a measuring range of between 0.1 lux and 50,000 lux accurate to within +/- 4%. Comes with a back-lit LCD screen (4 digit). Very easy to use, hand held, and ideal for surveying or testing light outputs. Supplied with its own carry case. Requires 1 x 9V (6F22) Battery (not included). Unit dimensions: 165 x 67 x 32mm