All units feature a direct-read digital high voltage display.
Various tubes are available to suit a variety of detection needs, and are easily installed within minutes. Model 612 is an analog type detector system with a built-in discriminator, and controls for gain, time constant, and offset. Model 614 is a combined digital and analog detection system, with all of the electronics and controls of the 610 plus those of the 612. All models share the same internal high voltage power supply and come with a separate line voltage power supply. This voltage determines the gain of the PMT, and therefore the value of the output current from the PMT's anode caused by light incident on the photocathode.