1pcs Double Biconcave Lens | 75mm Diameter and 300mm Focal Length Cuvettes You can collect gas and

You can collect gas and ignite that gas by applying an electrical current to the two platinum electrodes sealed in the end of the tube

5times of rated current

72mm depth

5 octave range perfect for a beginner band student

and a chrome-plated

1pcs Double Biconcave Lens | 75mm Diameter and 300mm Focal Length Cuvettes You can collect gas andHigh 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