This Base Unit for the Food Calorimeter comprises of a metal disc 100mm diameter with a boss for mounting on a 13mm retort rod.The unit forms the floor of the combustion chamber and has an inlet tubule 6mm diameter for the oxygen supply and a pair of pillars carrying the low voltage igniter coil. Also incorporated is a moveable crucible support enabling the crucible to be raised up to the igniter coil from outside the assembled apparatus.Supplied WITHOUT retort stand crucible or spirit lamp.Requires the following items which are available separately:Food Calorimeter (B8H24816)Nickel Crucible - 6mm diameter (B8R09529)Retort StandSpare Ignitor Coils are available to purchase as a pack of 10.