The Serstech SERS kit is used together with Serstech Arx or Serstech 100 Indicator to enhance the capability to identify dark coloured substances or mixtures with very low concentrations. The device is capable of detecting very low amounts of "street quality" narcotics samples, including heroin and many fentanyl variants. The Serstech SERS kit is based on patented technology used together with disposable SERS surfaces.

In short, the signal from a substance is amplified while fluorescence is being reduced. The disposable surfaces are available in packs of 20 or 100 and are delivered together with sample preparation bottles pre-filled with solvent.