1pcs Double Concave Lens | 50mm Diameter and 75mm Focal Length Tongs & Holders Eco-friendly PP raw material as

Eco-friendly PP raw material as out shell

Premium Quality: All beakers are made of thick and high-quality borosilicate glass

Premium Quality: Burette Clamp is made of high quality

Improved accuracy and robustness and is less expensive than traditional potentiometers

Brass Ball Diameter 2

1pcs Double Concave Lens | 50mm Diameter and 75mm Focal Length Tongs & Holders Eco-friendly PP raw material asHigh Quality Glass: Made from durable and high quality glass, this Double Concave Lens is designed to last and provide accurate and reliable results in a variety of scientific applications. 50mm Diameter: With a diameter of 50mm, this lens is perfect for use in a range of optical experiments, including refraction, reflection, and more. 75mm Focal: Featuring a 75mm focal, this lens is an ideal tool for creating focused images and light beams.