DIY MCU Calculator Kit Digital Tube Calculator Kit Set

This is a DIY calculator kit
It have Add, subtract, multiply, divide, negative number, and the decimal point function.
Easy through hole soldering
No need computer, the Calculator Kit comes pre-programmed
Six bright red 7 segment LED modules
Powered by a single CR2032 battery
Instant-on
Automatic sleep
Extra long battery life
Layered laser cut acrylic case

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