Chamber, Controller, 5 Microaqueduct slides, 30 piece gasket set, 50 - #1.5 coverslips. The Objective Heater and Objective Heater Controller is optional (needed for use of high numeric aperture objectives).
The objective heater is mounted to the upper end of the central retracting tube of the objective. The standard size fits diameters between 17 and 28mm. The medium size fits diameters between 23 and 29mm. There is also a large size to fit objectives with 26 - 35mm diameter.