1pcs Lens Double Concave, Spherical | 50mm Diameter and 500mm Focal Length Teeth Model Improved accuracy and robustness and

Improved accuracy and robustness and are less expensive than traditional Resistors

(100 Feet)

graduated cups make it easy to measure the exact amount you need

made up of Brass which is long lasting

Width 25mm

1pcs Lens Double Concave, Spherical | 50mm Diameter and 500mm Focal Length Teeth Model Improved accuracy and robustness andHigh Quality Glass: Made from durable and high quality glass, this Lens Double Concave, Spherical 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. 500mm Focal Length: Featuring a 500mm Focal Length, this lens is an ideal tool for creating focused images