Smart Geiger Counter Radiacode-103 with Free Mobile App. Nuclear Radiation Detector

Excellent. Instruction videos very good.

An incredible, real scientific instrument, not a toy. The model I have is the Radiacode 103. It is extremely sensitive; a granite headstone in a cemetery or war memorial monument will immediately show an increase in background as you get close. Natural background in a building from the stone, brick and plaster shows up quite clearly. It will even detect (though you need to sample for a few hours) the very low energy x rays emitted from a tritium keychain as the result of X ray fluorescence from the zinc sulphide phosphor. Smoke detectors and radium watches will drive it crazy with a red light and vibration warning (if enabled). It will show (again after a few hours of sampling) the peak from natural potassium 40 that is in food (and our bodies). It's a marvel of technology and if you have any interest in radiation, it's a terrific little gadget.

First impressions are that this is a very useful and versatile tool. Not used in a real situation yet but looks like its up to what it is designed for. Only mild constructive criticism - the menu that allows access to the different functions, I found a little awkward to access, plus no written instruction manual supplied, otherwise good value for money and i woul recommend.

The ability to create spectrograms of unknown samples places this device at another level compared to simple Geiger-Muller tube devices. While small it is a sophisticated analysis instrument, but it is the software that makes it stand out. I'm using the Windows PC and also iOS app. The mobile phone app is just excellent for work in the field. I've knocked one star off because my example 103 is way out of calibration and I will need to re-calibrate it (fairly simple task requiring access to a standard such as Thorium 232, but the info on the Radiacode website is not a great deal of help).