The HP48G doesn’t lie. 
Discussion
I miss my 48g
The tradition continues with my son. He is a die hard 48G user and it makes for funny stories from school.
You should check out the Swiss Micros DM42. It is a better version of the HP42S. RPN lives on… 
Love RPN
Agree. RPN and you will never be able to operate a basic calculator again. I prefer HP12C App on phone ✔️
wow getting one
Consider supporting a couple of guys in Switzerland with their DM12 (HP12). https://www.swissmicros.com/product/dm12l
Wow. This takes me back. I had a 48SX way back in the day. We had an entire course focused on using it in college.
I have a SX put up. I never used one as it was before my time. I took a class on the 48G and TI-85. I went back and taught one class session on the 48G. I still use one to this day. I recommend iHP48 for the phone. https://apps.apple.com/app/id1549608953
Brilliant. Thanks.