[plsvn]

I present the Greatest Calculator of All Time: the HP 12c.

Nah, I'd rather have the 15C.

[Z28.310]

Gimme a slide rule

[HartleyMBaldwin]

I still use my HP-15C almost every day. Once you go RPN, you never go back.

[crusty old prospector]

I have had an HP 12c since 1988. All I have ever done is replace the batteries. A quality product.

[chaosagent]

Even earlier, i.e., 1972-73

HP 35 and HP 45