Features: 3-in-1 Function: This tester combining three testing functions on one machine, it can detect the electric field, magnetics field radiation and temperature for you. Sound&Light Alarm: When the detected data beyond the safety value, it will emit sound and light to alarm you. Data lock function, one button lock radiation value for you to read the detected data more convenient. Portable Size: The small size of this tool is very convenient for everyday use, you can hold it in one hand e easily. The LCD display screen has the backlight for you to open or close according to your needs, and it also show you the graphics display radiation trend. Wide Applications: This tool can be used in your home, office, outdoor and indoor, computer, TV, refrigerator, etc. Specifications: Material: ABS Reading display: 3-1/2 digit display Electric field precisions: 1V/m Magnetics field precisions: 0.01uT Temperature precisions: 0.01/ Ranges: Electric field: 1v/m~1999v/m Magnetics field: 0.01uT~ 99.99uT Temperature: -10~70 Alarm threshold: Electric field: 40v/m Magnetics field: 0.04uT Test the bandwidth: 5Hz~3500Hz Sampling time: about 0.4S Operating temperature: 0~50 Operating hudidity: 80%RH Working voltage: Direct current 4.5V Power: 3 * AAA batteries (NOT INCLUDED) Package size: 165 * 60 * 40mm / 6.5 * 2.4 * 1.6in Package weight: 125g / 4.4ounce Packing list: 1 * Electromagnetics Radiation Tester