Teardown of vintage LED calculator. It has LED chips that has glowing regions of 660nm LED-s in 7 segment arrangement. Powered by 6F22 9V battery. Made in Malaysia.
It has a faulty last dot segment, that sometimes works, sometimes dosen't, but due to the age of it I think it's normal. Otherwise it functions fine.
Edit: It's a clone of Novus 850 and two segments doesn't work well.
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