Fangrui Product Details 1. Habotest Ht628b Multi-field Emf Meter Rechargeable Electromagnetic Radiation Tester 2. Built-in High-precision Electromagnetic Radiation Sensor And Microcontroller Chip Processor Can Quickly And Accurately Measure The Electromagnetic Radiation Value. 3. Electric Field Detection, Magnetic Field Detection, High-frequency Detection. The Magnetic Field Detection Function Can Combine Xyz Signal Detection Of The Actual Field Strength, With Precise And Sensitive Measurement. 4. Dual Alerts, When The Alarm Value Is Exceeded, Sound And Light Display Alarm. When The Measurement Value Is Less Than 0.12ut (12mg), The Display Screen Turns Green. When The Measurement Value Is Less Than 0.40ut (4.0mg), The Display Screen Turns Orange. When The Measurement Value Is Greater Than Or Equal To 0.40ut (4.0mg), The Display Screen Turns Red. 5. Usb Lithium Battery Direct Charging, No Need To The Battery, Convenient And Durable. 6. Clear Digits, Large Font Display, Data Reading Is More Intuitive. 7. Soft And Comfortable Hand Feel, Durable, Waterproof, Dustproof, Environmentally Friendly And Safe, Easy To Clean. 8. Size: 142 X 72 X 26mm 9. Weight: Approximately 150g