Electric field detection, magnetic field detection, high-frequency detection The magnetic field detection function can combine /Z signals to detect the actual field strength, with precise and sensitive measurement. The computers, mobile phones, household appliances, electricity, radio waves, microwaves, etc. that we come into contact with in our daily lives all generate electromagnetic radiation. Nuclear leaks, hospital X-rays, etc. belong to ionizing radiation, not electromagnetic radiation.Electromagnetic radiation can have an impact on the human mental, immune, and reproductive systems. APPLICABLE TO MEET Widely used in homes, offices, living areas, industrial equipment, power distribution rooms, high-speed rail signal base stations and so on LCD LARGE SCREEN Clear numbers, large font display, more intuitiv data reading Measuring range:3- Frequency range:40-1000Hz (The product printed words depending on the batch, but this does not affect use) Specifications: A: HT628A Color: As Shown Material: ABS Package Contents: 1 x EMF Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.