i bought a brand new HP 39gs graphic calculator (likely refurbished with protective film still on) off from my local bargain electronic shop (which sources stuff from taobao/aliexpress) for $6 USD
it works flawlessly
if anyone wants to do maths, then this is a no-brainer deal. Hell you could even load games and financial apps into it, or calculate essential stuff for case reshaping like trigonometry or the gradient of the lugs
it works flawlessly
if anyone wants to do maths, then this is a no-brainer deal. Hell you could even load games and financial apps into it, or calculate essential stuff for case reshaping like trigonometry or the gradient of the lugs