Optronic Laboratories OL Series 730 Radiometer / Photometers provide research-grade precision and accuracy at a fraction of the cost of comparable stand-alone systems. The OL 730E boasts a small footprint while research-grade precision and accuracy. It has internal preamplifier and a sensitivity of 1 X 10-14amperes. It may be virtually controlled via the USB interface. The OL 731 is a low-cost, hand-held radiometer/photometer that can be tailored to the spectral response of the user’s specific application requirements with the use of a range of sensors and filters.