Nuclear Radiation Detector Smart Geiger Radiation Counter Nuclear Gamma,X-ray Detector for iOS Android

Measures mostly high-frequency acoustic noise, not radiation. Every time there is a sharp sound nearby, or simply a slight knock on the phone, it interprets it as a "radiation count". Even if it is was honestly meant to measure the radiation, in reality it does not. Do not buy.

Not very sensitive but would help you find a safe spot in case of nuclear war. Put your phone in airplane mode, Bluetooth off, WIFI off.

Doesn’t connect to IPhone- damn thing uses a microphone connector- no good on your iPhone

Not clear what it is measuring, glass of water will do better job.

This produce simply does not work.