Look at the microscope form the side. Carefully turn the coarse adjustment knob to lower the body tube until the low-power objective almost touches the slide or until the body tube can no longer be moved. Do not allow the objective to touch the slide.
Look through the eyepiece and observe the specimen. If the view is out of focus, use the coarse adjustment knob to raise the body tube while looking through the eyepiece. Focus the image as best you can. Then use the fine adjustment knob to focus the image more sharply.
Adjust the lever of the diaphragm to allow the right amount of light to enter.
To change the magnification, rotate the nosepiece until the desired objective is in line with the body tube and clicks into place.
Look through the eyepiece and use the fine adjustment knob to bring the image into focus.
After each use, remove the slide. Return the low-power objective into place with the body tube. Clean the stage and the lenses with lens paper. Do not use other types of paper to clean the lenses, they may scratch the lenses.