The PiPer Pyrophosphate Assay Kit provides reagents for fluorogenic or colorimetric detection as low as 0.4 μM (fluorescence) or 2 μM (absorbance) inorganic pyrophosphate (PPi). The Phosphate Assay Kit can detect down to 0.2 μM Pi in purified enzyme systems. Each kit is sufficient for 1000 labelings.