Feature: 1. 1. High-quality material: Made of high-quality ABS material, durable, ergonomic, beautiful and comfortable to hold. 2. 2. Precise measurement: The detector is ideal for measuring electromagnetic field radiation levels around power lines, household appliances and industrial equipment, accurate and safe to use, portable and stable. 3. 3. Simple operation: Simple operation, high sensitivity, 50Hz-500MHz frequency range, suitable for the measurement effect of most radiation products, demonstrating personal understanding of radiation. 4. 4. Wide range of applications: Radiation testers are widely used in electrical equipment, electromagnetic radiation measurement, telephones, computers, TV copiers, fax machines, air conditioners, refrigerators, etc. 5. 5. Specification: Material: plastic shell + metal electronic coreSize: 148×20×25mmPower supply: 1.5V (AAA) × 2 (not included)Frequency: 50~500HzTest ambient temperature: 32~122°F (0-50°C) Package List: 1* Electromagnetic radiation test pen Note: When testing the mobile phone, keep the mobile phone in the DC charging state, otherwise the test pen will not alarm, and the test computer should be kept plugged in at that time.