Gauss meter - Tesla meter application field

            Electricity and magnetism are phenomena that exist in nature all the time, such as lightning and magnets. Humans have known for a long time that they can use electricity and magnetism to improve and enrich their lives. Besides of the existence of natural electromagnetic field, people for the convenience of life developed many electrical appliances, such as the commonly used mobile phones, TV, hair dryer, induction cooker, microwave ovens, computers, air conditioning and other household appliances, even the MRT, electric train, power transmission and transformation equipment and other public facilities, convenient life also added some artificial electromagnetic field.
            Question 1: what is the electromagnetic field measuring instrument -- gaussian meter, tesla meter, fluxmeter. 

            The electromagnetic field is the electric field and the magnetic field collectively called.
The term "field" refers to an area of space where forces are felt by any object that enters the area. For example, we live in the earth's gravitational field, we live in the magnetic field of the earth, and we are surrounded by strong electric fields during lightning.
            Question2: can the electric field be explained in more detail?
            The existence of electric field is often found in life, such as the explosive sound that takes off the sweater in winter, and the electric shock that touches the handle of the door. These are the electrostatic phenomena generated by friction. In the use of electricity, there is an electric field around wires or electrical equipment as long as there is a voltage. The electric field is generally measured in kilovolts per meter (kV /m).
            Question 3: can we give a more detailed explanation of the magnetic field?
            Put a magnet under the cardboard, sprinkle iron powder on the cardboard, and you will find that the two ends of the magnet are connected by several circles of stripes, this is the magnetic field. In the use of electricity, a magnetic field is also generated around a wire whenever a current passes through it. The magnetic field is expressed in units of tesla (T) or gauss (G) or milligauss (mG) or microtesla (μt).
1 tesla =10,000 gauss
1 gauss =1,000 milligauss
1 microtesla =10 milligauss