Description: 【High Quality Material】: Portable Handheld EMF tester is made of high quality PP material, which is high strength and durable for long term use. 【Clear Display】: The high precision digital dosimeter equipped with 5 color LED indicator lights, clear at a glance , easy for button use. 【Easy to Use】: Multifunctional electromagnetic tester with sound and light dual alarm, easy to detect value, easy to use, non slip design makes your hand comfortable and not easy to drop. 【Multifunction】: tester is more practical for detecting electric field and field .Suitable for broadband electromagnetic field measurement from 50Hz to 20000Hz, quickly and accurately measure electromagnetic values. 【Wide application】: Electromagnetic field tester is widely used in homes, offices, living areas, industrial equipment, power distribution rooms, high speed rail, signal base stations, etc. Specification: Product Name: Electromagnetic Tester Measuring range: 0-20+ ; Power supply: 9V battery Accuracy: 5% Product size: 15cmx5.5cmx3cm/5.91inchx2.17inchx1.18inch Measuring frequency: 50/60Hz Operating temperature: 18~49 °C (0-120F) Package Includes: 1 Electromagnetic Tester 1 Manual Note: Please allow slightly errors due to manual measurement and different monitors.