Filters for Polymerase Chain Reaction (PCR) instruments are called PCR filters.PCR is a technique to make multiple copies of a short sequence of target DNA, exponentially amplifying it. DNA must be amplified so that there is enough material to reliably detect and identify it with a high degree of confidence. PCR is used in a multitude of applications, including infectious disease diagnosis, criminal investigation.

One set of PCR filters consists of one excitation PCR filter,one emission PCR filters and one dichroic filter.The excitation and emission PCR filters are engineered for extremely high transmission over a desired wavelength band, which is prescribed by the underlying fluorophore used to probe the reaction.