Used for detecting the presence of corrosive sulphur in petroleum products.The apparatus consists of a bath either dual purpose (50°C & 100°C) or a boiling bath (100°C only) without stainless steel and copper strips of definite size 6 or 18 test tubes can be accomodated in each type of bath. Provided with energy regulator. Suitable to operate on 220 volts AC. mains. Also available with digital temperature controller and indicator.