In order to do proper measurements, it is necessary to have one or more meters that measure what is called Radiofrequency (RF) (or high frequency) electromagnetic radiation: WiFi, WiMax, Cell Phones, Cell Phone Towers, Cordless Phones, Smart Meters, Radar, etc. Furthermore, it is necessary to have a meter that measures what is called Power Frequency electric and magnetic fields. This can be done effectively with what is called a Tri-Field meter. Also, there are high-frequency transients that run on the power-frequency electric wires that can have a negative effect on one's health called Dirty Electricity. This can be done with what is called a Stetzer Meter or a Stetzerizer, named after Dave Stetzer. Finally, one can buy a meter to measure one's Body Voltage.