Three-in-one precision test: The electromagnetic field tester can accurately measure electric fields (1-1999 V/m), magnetic fields (0.01-99.99 T) and ambient temperature (-10-70 degrees Celsius). Easily switch between Celsius and Fahrenheit for accurate readings every time. USER-FRIENDLY AND VERSATILE: Ideal for experts and beginners alike, this tester helps you monitor the electromagnetic radiation of everyday appliances such as TVs, induction cookers and computers. Stay informed of potential hazards and ensure a healthier living space. Multiple measurement modes: With maximum, minimum and average modes, as well as a convenient "Hold" button to capture temporary readings, this tester can meet all your measurement needs. Get reliable and accurate results in any situation. Portable and compact design: Put it in your pocket and carry it with you, ensuring that you can measure electromagnetic fields anytime, anywhere. Intelligent power saving: The tester's backlight will automatically turn off after 20 seconds and turn off completely after 3 minutes of inactivity, designed to save battery power and make it efficient and durable for long-term use. Power supply: AAA1.5V*3 (not included) Size: 152*52*26.5mm Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.