Good for
Used calculators for engineering
RPN calculators with the math engineers use: the HP-15C and its reissues for matrices, complex numbers, root finding and integration, the 11C as a simpler everyday Voyager, the 16C for binary and hex work, the HP-34C that first put a root finder and integration in a pocket, the 32SII and 42S in the Pioneer body, the HP-41 series with application pacs, and the HP 48s for symbolic math and graphs. Pick by the math you need, then check the batteries, the display and every key.
13 calculators we cover.
HP
VoyagerHP-11C
- Launched
- 1981
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$80–$130 typical ask
58 on eBay
HP
VoyagerHP-15C (original)
- Launched
- 1982
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$95–$200 typical ask
45 on eBay
HP
VoyagerHP-16C Computer Scientist
- Launched
- 1982
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$160–$280 typical ask
33 on eBay
HP
VoyagerHP 15C Limited Edition
- Launched
- 2011
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$280–$600 typical ask
8 on eBay
HP
VoyagerHP 15C Collector's Edition
- Launched
- 2023
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$170–$240 typical ask
2 on eBay
HP
RPN programmableHP-41C
- Launched
- 1979
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory · Mag cards · Plug-ins
$200–$400 typical ask
23 on eBay
HP
RPN programmableHP-41CV
- Launched
- 1980
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory · Mag cards · Plug-ins
$190–$290 typical ask
79 on eBay
HP
RPN programmableHP-41CX
- Launched
- 1983
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory · Mag cards · Plug-ins
$280–$460 typical ask
28 on eBay
HP
RPN programmableHP-34C
- Launched
- 1979
- Entry and display
- RPN · LED
- Features
- Programmable · Keeps memory
$370–$380 typical ask
1 on eBay
HP
RPN scientificHP 32SII
- Launched
- 1991
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$100–$170 typical ask
28 on eBay
HP
RPN scientificHP-42S
- Launched
- 1988
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$190–$260 typical ask
19 on eBay
HP
GraphingHP 48G
- Launched
- 1993
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory
$100–$140 typical ask
28 on eBay
HP
GraphingHP 48GX
- Launched
- 1993
- Entry and display
- RPN · LCD
- Features
- Programmable · Keeps memory · Plug-ins
$230–$340 typical ask
45 on eBay