1pcs Double Biconcave Lens | 75mm Diameter and 300mm Focal Length Instruments easy-grip markers—20 each of the

easy-grip markers—20 each of the 10 colors

For visual demonstration of electric fields

This plastic disposable sheaths

Give your students the chance to see the solar system in action

Sphalerite

1pcs Double Biconcave Lens | 75mm Diameter and 300mm Focal Length Instruments easy-grip markers—20 each of theHigh Quality Glass: Made from durable and high quality glass, this Double Biconcave Lens is designed to last and provide accurate and reliable results in a variety of scientific applications. 75mm Diameter: With a diameter of 75mm, this lens is perfect for use in a range of optical experiments, including refraction, reflection, and more. 300mm Focal Length: Featuring a 300mm focal length, this lens is an ideal tool for creating focused images and