Profile: Spectrum Techniques, LLC specializes in nuclear measurement instrumentation. Our product line includes geiger mueller counting systems & accessories, gamma counters and wipe testers, UCS30 universal computer spectrometer and ST400 scintillation processor. Our geiger mueller counting systems & accessories are used in nuclear science studies. These are used for teaching modern physics, nuclear medicine, health physics, radio chemistry, biology and many applied nuclear physics. Our ST400 scintillation processor provides a versatile & convenient interface between many types of scintillation detectors and most commercial multichannel analyzers. The instrument provides high voltage to power the photomultiplier tube, a preamplifier, an amplifier with adjustable gain and an amplifier input for use with existing external preamplifiers.