The EMF tester is a device for the simultaneous measurement of electric and magnetic fields. It is ideal for home use to check routers, Bluetooth devices, radios, televisions, computers, printers, microwave ovens, refrigerators, and mobile phone towers. The tester offers a measurement range of 1 to 1999 V/m for electric fields and from 0.01 to 99.99 µT for magnetic fields. It features an alarm threshold of 40 V/m or 4 µT, which triggers an audible alarm when exceeded. The EMF tester operates within a frequency range of 5 Hz to 3500 MHz and takes less than one second to provide a measurement result. A built-in 700 mAh lithium battery with a USB-C interface makes the device convenient and durable. An LED display allows for clear reading of measurement values, and the compact design with a single button ensures easy handling. Additionally, the EMF tester automatically shuts off when inactive to save energy.