Most common calculators in the forum?

[donovan1983]

Here's what's in my collection currently:

• Casio fx-115ES Plus
• Casio fx-991EX
• Casio fx-9750GII (with fx-9860GII firmware)
• Casio fx-9750GIII
• HP 15C
• HP 35s
• Sharp EL-506D
• TI-36X Pro
• TI-89 Titanium
  

The calculator I've had the longest is the 15C. Unfortunately, I didn't know what I had until years later after it had already suffered damage in multiple moves. Despite its rough shape it does still work, except for a dodgy ENTER key. Until very recently with my purchases of the 40gs and the 48gII, it was the only calculator I have that wasn't purchased brand-new.

The Sharp EL-506D is the one I've had the second-longest (it was bought just a few months after the 15C) and it's the oldest calculator that I had bought brand-new. It was a NOS item bought on clearance in a local store. Somehow I managed to keep it in excellent condition, and even kept the user manual, despite having gotten it over 20 years ago.

The 35s gets the most use of the bunch due to school, followed by the Casio fx-991EX. I've tried to stick with NCEES-approved calculators even when not strictly required by a class. I also try to make sure I can use multiple calculators since it both makes sure I am learning the material and that if something happens to one calculator just before an exam I can readily switch to another. Still, I definitely favor the 35s due to RPN as well as its functions and programmability.

Edit: Removed "on the way" calculators.