The heat absorption radiation comparator with heat source and differently coated domes attached is ideal for comparing the heat absorption and radiation between shiny and dull items. The thermometer attachments on each dome make it easy to use and obtain data. The experiment guide included is a great aid for learning about how to use the apparatus and is very user-friendly.Contains radiation comparator apparatus white screen and experiment guide; electric bulb heat source attachedBase dimensions: 254mm x 178mm x 25mmHeight (to tip of domes): 165mm2 domes - one black and one shiny metalThermometer holders present on both domes (thermometers not included)