1Made of high quality allsteel material, it is durable and hard to wear 2The magnification is adjustable and the image is clear, making it easy to observe the texture and structure of tiny things 3There are six objective lenses available, 4X, 10X, 20X, 40X, 60X, 100X 4Each objective is equipped with a single plastic box for easy storage 5This product is dedicated to a variety of biological microscopes, using a Standard RMS interface 20.2mm.Features: Made of high quality all-steel material, it is durable and hard to wear.The magnification is adjustable and the image is clear, making it easy to observe the texture and structure of tiny things.There are six objective lenses available, 4X, 10X, 20X, 40X, 60X, 100X.Each objective is equipped with a single plastic box for easy storage.This product is dedicated to a variety of biological microscopes, using a Standard RMS interface 20.2mm. Specifications: Condition: 100% Brand New Material: Steel Standard:Standard RMS interface 20.2mm Type: 4X, 10X, 20X, 40X, 60X, 100X Achromatic Objective Lens (Optional) MagnificationNumerical apertureWorking distanceThickness of the coverslipImpregnating mediumSpring4X0.1mm18mm0.17mmNoNo10X0.25mm7mm0.17mmNoNo20X0.4mm0.55mm0.17mmNoYes