Eye Strain. When you stare at screens all day, your eyes can get tired. Take a break with the 20/20/20 rule. Look at an object at least 20 feet away for 20 seconds every 20 minutes, says Ivan Schwab, MD, a spokesman for the American Academy of Ophthalmology.
Once you have the dial on your volt meter set to measure voltage, simply touch the black lead to the negative (-) terminal on your battery and the red lead to the positive ( ) terminal on your battery.
Measure the voltage of a 9-volt battery: Set the multimeter to the â20 DCVâ setting so that the. meter will measure DC voltage. Touch the red meter wire to the positive terminal of the battery, the black meter wire to the negative terminal and record the value (see Figure 3).