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Radiation detectors. Such as the Radiacode or the Open Gamma Detector.
Binoculars are quite portable, very useful, and phones don't do a good job at zooming in like that.
Smart watches integrate with phones but the phones by themselves are not so good at measuring the heart rate and other parameters directly.
Mini projectors. UV flashlights. Tools in general... There is so much actually. What type of gadgets are you looking for?
Can phones "detect" really high radiation on the camera if it's high enough or is that film only?
Cleverly, even low levels can be detected. I love how creative early smartphone developers could be.
https://play.google.com/store/apps/details?id=com.rdklein.radioactivity
What do you mean? Early apps was all stuff like this that nobody used. Nowadays apps are useful fintech services and photo filter apps that cost less than a coffee per month and fun free games that everyone can play, isn’t that much better?
/s