Profile: Advanced Research Instrument Corp. is a manufacturer of electronic products. Our product line includes counting pre-amplifiers (pulse output), current to voltage amplifiers, rate meters, counters, power supplies, & computer interface cards. Our F-100T pulse pre-amplifier with TTL output electronics, consists of a linear pre-amplifier located as close to the PMT or channeltron as possible, linear amplifier, and a single channel analyzer used as a noise discriminator. The F-100T combines all three units into one, eliminating many controls, dials, and cables at a reduced cost, but with higher reliability and performance. Each unit also has an externally accessible threshold setting for noise discrimination. The output pulse width may be extended to meet minimum pulse width requirements of a given rate meter. The OSP-1 is an AC/DC coupled amplifier extending the sensitivity of any oscilloscope up to 1000x. The maximum sensitivity of most oscilloscopes is 10mV/division. However, the OSP-1 extends the sensitivity 1000x to 10μV/division. The difference input and a low pass filter are absolutely essential features for design or troubleshooting of sensitive electronic circuits, potential ground loops, testing of sensors and noise measurement. The DC offset may be employed for a minute difference signal measurement in the presence of high common mode or DC offset voltages.