Tar Viscometer is used for verifying viscosity of curt back bitumen and road oils. Its design conforms to IS guidelines. This mild steel made laboratory apparatus requires 230v voltage and its frequency is 50 Hz. This Tar Viscometer comprises of standard components like ss bath, sleeve, orifice, ball and stirrer with lifting clip. This apparatus also contains energy regulator and electrical heating system. Its standard has been verified on the basis of its design precision, service life, strength and performance.