Basic earth ground testers from ttl technologies are manufactured by fluke corporation of usa. These earth ground testers are used for detecting reliable ground connections in several applications. These are easily movable and easy to operate. For this reason these are used for lightening protection levels and periodic testing during routine maintenance. These testers have several standard features including 3-pole fall of potential and 2-pole ground resistance, and enable users to capture values with a single button, making it a handy tool for electrical contractors, utility test engineers and earth ground specialists in the field. Earth ground resistance measurements provide smooth and safe electrical installation and also take care of power quality problems. Other features include large, dual, backlit display, a hazardous voltage warning, and a rugged holster. The automatic noise voltage detection of these testers provides accurate measurements, and alert users to measurements outside an adjustable limit setting.