Brand new, manufactured July 2025, with guaranteed spectral resolution scintillation crystal NaI(Tl) 50*50 mm (2"*2"), hermetically sealed with reflector and optical window. Resolution checked using R1847 photomultiplier tube and GS-MAX8000 gamma spectrometer hardware. 

Want to build a gamma spectrometer? It's your chance.

Check out my other lots, I hope you will find something interesting!

Fell free to ask questions.