Marina Photonics provides Gigahertz photon counters and interfaces that are Time-correlated, multiple Channel, and affordable. There is no dead time or lost photon counts at 4 Gigaphotons/second. USB and 400 Megabyte/second computer interfaces are available. The PV16 variable gain - dual digital output photon amplifier allows matching down to 300 uv for Hybrid Tubes and lower gain for electron multipliers. Beyond 1 GHz photon counting, analog output may be combined to extend dynamic range.