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The present research report describes on the characterization of potassium bisulfate or potassium hydrogen sulphate (KHS) single crystals grown using slow evaporation method at room temperature.  The KHS crystal was found to be crystallizing in centrosymmetric orthorhombic structure. The existence of different functional groups in the crystal was assured by FTIR investigation. The optical transmittance of the KHS crystal was investigated using the UV visible spectrum. Moreover, the band gap energy as well as optical constants including dielectric constant, reflectance, extinction coefficient, optical conductivity, refractive index, and electrical conductivity was reported.