Selenium meter
A selenium meter is a little gadget that can help us measure light. It is called "selenium" because it has a material called "selenium" inside it that can react to light. When light hits the selenium, it becomes an electrical signal and the meter tells us how much light is there.
Think of it like a little robot that can read light. You take it outside, point it at the sun, and the robot measures how bright it is. You can also use it inside your house, and the robot will tell you how much light is coming in from the window.
This can be really helpful for photographers or people who want to monitor the light in their environment. With a selenium meter, you can make sure your camera settings are just right for the lighting conditions or you can make sure plants are getting enough light to grow.
Think of it like a little robot that can read light. You take it outside, point it at the sun, and the robot measures how bright it is. You can also use it inside your house, and the robot will tell you how much light is coming in from the window.
This can be really helpful for photographers or people who want to monitor the light in their environment. With a selenium meter, you can make sure your camera settings are just right for the lighting conditions or you can make sure plants are getting enough light to grow.