The Joules Calorimeter comes with a fitted insert made from copper, including a lid with a stirrer and spin-free socket head terminals supporting conducting rods with a resistance heating coil of 2 ohms. This allows for the precise measurement of electrical energy used to heat a specific amount of water by a certain number of degrees when inserted into a calorimeter cup. Includes: 2 x 4mm diameter socket head terminals Small heating element of approx. 2 ohms resistance Plastic stirrer captive on the heater support pins Read Instruction Sheet Brand: IEC Weight: 0.096 kg Dimensions: 105mm (H) x 55mm (Dia) Heater element: 2 ohms approx. 2 to 12V DC operation (element immersed) Product Code Item Description SE.HL0840-001 Joules Calorimeter SE.PA0840-002 Spare Insert and Stirrer 2 Ohms SE.PA0840-003 Spare Element 2 Ohms SE.PA0840-010 Spare Stirrer Rod & Disc