Quantity: one Test bandwidth: 50Hz-2000MHZ Sampling time: about 0.4 seconds Working voltage: 9V Battery model: 6F22 9V (included) Weight: 190 grams Dimensions: 132mm (length) X 69mm (width) X 29mm (height) Reading display: three and a half liquid crystal display, large reading 1999 For environmental electromagnetic radiation testing: measurement of radiation sources such as living rooms, offices, computer rooms, control rooms, cables, high-voltage lines, monitors, etc. It is used for the measurement of electromagnetic radiation of household appliances: testing and analysis of radiation sources such as mobile phones, computers, computing machines, copiers, fax machines, air conditioners, refrigerators, etc. Simple and quick measurement of the intensity of electromagnetic radiation around household appliances, cables and industrial equipment. The numerical contrast is obvious, which is suitable for the measurement demonstration of the effect of radiation products and personal understanding of radiation. Enjoying different measurement quality at the same price, friends no longer have to worry about finding a reliable electromagnetic radiation tester. Measurement procedure: 1. Press the power switch and align the electrical appliance under test to prepare for measurement 2. The handheld instrument slowly approaches the object to be measured until it contacts it. The closer to the object to be measured, the higher the electromagnetic radiation value. Note: The high-voltage object can be measured at a long distance. 3. Try to change the angle of the instrument during the measurement process, and the measurement effect was better. 4. If the power supply of the object is cut off during measurement, the reading of the instrument should return to zero unless there is other interference. About the battery: 1. When the instrument test data becomes smaller or does not alarm, it means the battery is insufficient, please replace the battery in time. 2. Remove the battery when the instrument does not need to be stored.Good quality product