Ambion® RT-PCR grade water is tested for prokaryotic as well as eukaryotic genomic DNA contamination using an ultrasensitive PCR assay. It is provided in 10 x 1.5 mL. Prokaryotic DNA contamination is assessed by performing PCR with primers to 16S rRNA. Eukaryotic DNA contamination is assessed by performing PCR with primers to 18S rRNA. It is rigorously tested for contaminating nonspecific endonuclease, exonuclease, and RNase activity and is suitable for any PCR application.