The THz-TDS Terahertz Time-Domain Spectrometer is the first commercially available turn-key terahertz pump-probe spectrometer designed for amplified laser sources. When combined with an OPA, the sample of interest can be excited by ultraviolet to mid-infrared radiation and probed with low frequency THz radiation. THz-TDS incorporates Newport's highest quality optics, opto-mechanics, balanced detector, optical chopper, vibration control, delay-line stages, and easy-to-use LabVIEW™ based software to deliver high quality results with consistency. THz-TDS can be upgraded and reconfigured to support other ultrafast spectroscopy techniques as your research needs evolve.