Since 1845, Gurley has been a major designer and producer of measuring instrumentation for a variety of industries and applications. Our areas of expertise include optical encoders for the precise measurement of position ......Since 1845, Gurley has been a major designer and producer of measuring instrumentation for a variety of industries and applications. Our areas of expertise include optical encoders for the precise measurement of position or speed digital readout systems for retrofitting machine tools generation and replication of precise patterns on glass and similar substrates physical properties test instruments for medical tubing, paper, films, textiles, and other sheet goods mechanical components and open-channel flow meters to measure water velocity.