Quantity: One Test Bandwidth: 50 Hz–2000 MHz Sampling Time: Approximately 0.4 seconds Operating Voltage: 9 V Battery Model: 6F22 9V (included) Weight: 190 grams Dimensions: 132 mm (Length) x 69 mm (Width) x 29 mm (Height) Reading Display: Large LCD display, 1999 resolution For environmental electromagnetic radiation testing: measuring radiation sources such as living rooms, offices, computer rooms, control rooms, cables, high-voltage lines, monitors, etc. It is used for measuring electromagnetic radiation from household appliances: Testing and analysis of radiation sources such as mobile phones, computers, IT equipment, copiers, fax machines, air conditioners, refrigerators, etc. Quick and easy measurement of electromagnetic radiation intensity around household appliances, cables, and industrial equipment. The digital display is clear, making it suitable for demonstrating the measurement effect of radiation products and for personal understanding of radiation. Enjoying high-quality measurements at the same price, you no longer need to worry about finding a reliable electromagnetic radiation tester. Measurement procedure: 1. Press the power switch and align the electrical device to be tested to prepare for measurement. 2. Slowly move the handheld instrument towards the object to be measured until it makes contact. The closer you get to the object, the higher the electromagnetic radiation value. Note: High-voltage objects can be measured over long distances. 3. Try changing the angle of the instrument during the measurement process; this will improve the measurement effect. 4. If the power to the object is interrupted during measurement, the instrument reading should return to zero unless there is other interference. About the battery: 1. When the instrument's test data becomes smaller or no alarm is triggered, it means the battery is low. Please replace the battery promptly. 2. Remove the battery when the instrument is not being stored. Good quality product