Optimizing assay window width via thallium-sensitive indicator dye and masking agent, FLIPR® Potassium Assay Kit can be used measure ligand- and voltage-gated potassium channel activity – even those with low conductance or low expression levels. Proprietary masking agent reduces background fluorescence and enhances SNR, while no-wash format simplifies automation using 96-, 384-, and 1,536-well formats in FLIPR and FlexStation microplate readers.