It is made as per IP 14, ASTM 524 and IS 1448 ( P:8)-1967 Standrads. It is used to determine the amount of carbon deposite when an oil evoparated under specified condition. The apparatus consists of a solid metal bath having 5 wells to accomodate cocking bulbs, The heavy duty heating elements provided around the bath. Supplied with 5 cocking bulbs and one syringe.