Features 【ACCURATE MEASUREMENT & HIGH SENSITIVITY】This electromagnetic field radiation detector uses advanced technology to provide high sensitivity and accuracy, measuring EMFs from 50Hz to 20,000Hz, making it ideal for home, office, and ghost huntings applications. 【LED INDICATOR & EASY READINGS】The LED indicator displays em f levels with color-coded feedback: dark green (1-2.5mG), green (2.5-5mG), yellow (5-10mG), orange (10-20mG), and red (20+mG), ensuring easy interpretation of radiation levels. 【BATTERY POWERED & PORTABLE】Powered by a 9V 6F22 battery, this portable em f meter is lightweight, compact, and made from ABS material, making it easy to carry and use for on-site radiation detection. 【EASY TO USE & ONE-HAND handling】With a single-button design, this em f tester is simple to operate with one hand, making it convenient for quick and accurate radiation measurements in home, office, or outdoor environments. 【WIDE APPLICATION & RADIATION SAFETY】This em f detector is widely used for ghost huntings, identifying high-radiation devices, and helping users make informed decisions to limit exposure, ensuring radiation safety in various settings. 1. [Accurate Measurement] This electromagnetic field radiation detector adopts advanced technology, providing high sensitivity and accuracy, can accurately measure a wide spectrum of EMFs ranging from 50Hz to 20,000Hz. 2. [LED Indicator] The LED indicator helps you easily understand the electromagnetic field, which turns dark green for 1 to 2.5mG, green for 2.5 to 5mG, yellow for 5 to 10mG, orange for 10 to 20mG, and red for 20+mG. 3. [Battery Powered]: This portable em f detector is powered by a 9V 6F22 battery, making it convenient to use. Made with ABS material, sturdy and resistant to impact. 4. [Easy to Use] With just one button, this electromagnetic field radiation tester is easy to operate with one hand, compact and lightweight, allowing for easy pocket storage and carrying. 5. [Wide Application] Widely used in ghost huntings and measuring electromagnetic fields, this detector helps identify devices with high radiation and assists users in making decisions to limit exposure. Specification: Item Type: Electromagnetic Field Radiation Detector Material: ABS Model: ER10BB Measurement Range: 0-20+mG Power Supply: 9V 6F22 dry battery x 1 (shipped without battery) Accuracy: 5% Size: Approx. 150x55x30mm/5.9x2.2x1.2in Measurement Frequency: 50 60Hz Working Temperature: 18-49℃ (0-120℉) How to Use: Step 1: Start the tester, press and hold the switch of the tester with your thumb, and all LED lights will flash in sequence. The instrument will start the self check program, and the first green LED light will remain on. Step 2: Place it close to the electromagnetic radiation source, the LED light will indicate the em f range of that level, and the LED light will flash. Step 3: Moving or rotating the device left or right may change the reading, and the highest reading is the most accurate. packing list: 1 x Package List 1 x Electromagnetic Field Radiation Detector 1 x User Manual