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