A waterproof detector and cable assembly for its portable radiometer that’s designed for performing a wide range of underwater UV light studies is available from International Light Inc., of Newburyport, Mass. The underwater radiometer detector and filter combinations are available for performing NIST traceable measurements from 200 to 1,100 nm and low-light levels down to 0.5 picowatts/cm2 underwater using the firm’s IL1400BL research radiometer.