Profile: G & R Labs deals with light measurement and calibration equipment. Our products include model 202, 400, 320 and 100. Our model 202 intensity meter is a dual channel version of the Model 200. This unit operates from a single 9-volt battery and meets all the requirements of IEC, UL, and CSA. The measurement range is from 1.00 MW/CM2 to 19.999 W/CM2 (20MW/CM2), in two scale positions. The model 400 is a measurement instrument with diverse capabilities. A built-in computer allows the model 400 to store sensor readings and calculate average values, percent deviations, and other data values. The large display format (4 x 20 characters) gives space for many readings to be viewed at one time. This capability saves writing down values and doing calculations to get source uniformity or exposure consistency. The model 400 is programmed for a variety of operation modes. This allows for a selection of a mode which best suits the data wanted. The model 400 is programmed for the mode sets that best suit the measurements needed.