The celestron science kit has a telescope and microscope and many accessories making it a very useful kit it comes with a 50mm refractor telescope varying eyepieces and a 3x barlow lens for powerful magnification the microscope has a 24 piece accessory kit adding practicality it comes with prepared and blank slides and a full set of tools to get you going with everything you need to get started this celestron package is a fine choice features 50mm refractor full height steel