Empty frozen juice can, plastic food wrap, duct tape.
Remove both ends of the can. Place a piece of plastic food wrap over one end. Tape one side. Pull on wrap to stretch out to the other side and tape down. Repeat all around. Place one more piece of duct tape around the end of the container to cover the existing pieces of tape and to create a complete seal.
“Hold the scope about an inch or so below the water surface to see.”
“You can use any type of container, can or even a bucket as long as it is waterproof and the plastic food wrap can be stretched across and secured with duct tape.”