Use only approved tools and testers.
Remember: There must be a complete circuit to cause electrical shock. By observing the above rule, you may prevent a current passing your body.
Many customers have, near their equipment, rubber floors mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock.
and similar units. (This practice ensures correct grounding of the units.)
Please read > General SAFETY