SWEETWATER, Texas, Aug. 7, 2015 — The PDM02-9111-TTL photon counting module from ET Enterprises Ltd. incorporates a high-sensitivity, low-noise, 25-mm photomultiplier, a fast amplifier discriminator and a low-power, high-voltage supply. A wide dynamic range is achieved through the combination of high-speed electronics and a fast photomultiplier with low dark counts. A positive polarity high voltage supply is used for maximum count-rate stability at very low light levels. The spectral range is 280 to 630 nm. The TTL output of the deviceis fully compatible with the MCS-CT3 multi-channel scaler/counter timer module for use in photon counting applications.