Why does the coverslip have to be placed on the slide diagonally? You are watching Carry the Light - 4Him on Godtube.
Look through the next link on how the microscope works and view the video.
The unit is shockproof and waterproof to 1 meter for 30 minutes.
Detectives and others in soft clothes will find that the Wedge disappears neatly in a pants or jacket pocket, yet remains easy to access.