Features: 11. High-quality material: Made of high-quality ABS material, durable, ergonomic, beautiful and comfortable to hold. 22. 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. 33. Simple operation: Simple operation, high sensitivity, 50Hz-500MHz frequency range, suitable for the measurement effect of most radiation products, demonstrating personal understanding of radiation. 44. 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. 55. Material: plastic shell + metal electronic core Size: 1482025mm Power supply: 1.5V (AAA) 2 (not included) Frequency: 50~500Hz Test ambient temperature: 32~122F (0-50C) Package Included: 1* Electromagnetic radiation test pen