Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

eTesla Screenshots

iPhone

About eTesla

By using data from the phone internal compass,
This app can measure the magnetic field generated from metals
Or high electromagnetic emission from High Voltage line ,Transformer ,
Electric motors,and some home appliance such as microwave oven.

The units of measure is Tesla -µT : Nikola Tesla (10-Jul-1856 - 07-Jan-1943)
inventor of the Tesla coil and developer of inductor motor working by alternate current.
The normal earth emissions is around 20-40 µT.

High magnetic field can reach 200 µT (e.g. near to speakers).
In very high magnetic field (e.g. near electric motors ) it can be over 300 µT
such high magnetic field ,can easy damage credit ,mechanical watch .

If the phone has been exposed to e high magnetic field , the sensor need to be recalibrate by just shake the phone until the data reader become normal range.

A alarm can be set by the slider, over that value the value become red and the phone will vibrate.

So: stay away from strong magnetic field : find it and avoid it.