These meters comply with IEC SANS 600790:2000 and IEC SANS 60079-11:1999 which is an electrical apparatus for explosive gas atmospheres. The general requirements of part 0 and part 1 are intrinsic. The approved explosive protection rating of this equipment is suitable for use in Zone 1 hazardous areas. Group I has the coal mines underground and Group II is on the surface. It has an Intrinsically Safe and dual display and backlit display. Measured values can be read directly and accurately. Digital multimeters have high input impedance, which translates into low instrument loss. Digital calculations are performed internally, and many models provide advanced functionality that allows them to display other values (capacitance, frequency, peak values, etc.). Some models can connect and transfer data to a computer. Digital multimeters have become essential tools for checking safety, quality, and malfunctions in our contemporary world, where electronic devices have become ubiquitous.