REVIEW: Produced by Tsmall? Good quality meter, measures are not professional but better than the others 20 € meters, price is low but not the lowest, this may indicate higher quality.
Ideal to measure magnetic fields (low frequency networks) electric nets, power lines, ecc..
Can’t measure radio electric fields (RF) like phones, wifi, radar, repeaters, etc..
Works with stylus batteries, working time 10 hours.
MY OPINION: Build quality is not bad, better than cheaper competitors, is a good starting point to check magnetic fields around you and your house.