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HP 28S Advanced Scientific Calculator
$81.00 ⚠️ High Price Buy on eBay
Asking Price
1 day ago
Listed 2026-05-10
Manakin-Sabot, Virginia, US
From listing #360975: ✅✅ HP 28S Advanced Scientific Calculator Clamshell Design Working With Battery
View Listing
Clamshell scientific calculator, works perfectly, requires 3 LR1 1.5V batteries.
Item Details
Brand:
Hewlett-Packard
Item Type:
Computer
Calculator
Computer Model:
HP-28S
(1986)
Platform:
HP Calculator
Cosmetic condition:
Good - Moderate wear, normal for age
Functional condition:
Fully Working - Tested and fully functional
Comes With
Hewlett-Packard HP-28S - Computer Market Overview
Based on
85 sold
computers,
one should expect to pay ~$65 for a working unit.
However, this unit's condition (Good / Fully Working) brings its guide price to $70.
14 others are also listed for sale.
This item ($81)
is 1.2x the guide price (~$70).
Price Position — Good / Fully Working (47 sales)
$25
Median $68
$499
This item: $81
Price by Condition
| Refurbished | Fully Working | Partially Working | Powers On | Untested | Not Working | For Parts | |
|---|---|---|---|---|---|---|---|
| New | — | ~$289 | — | $225 (1) ~$231 | — | — | |
| Mint | — | ~$238 | ~$178 | ~$167 | ~$190 | — | — |
| Excellent | ~$120 | $156 (2) ~$109 | ~$82 | ~$76 | ~$87 | ~$38 | ~$27 |
| Good | ~$75 | THIS ITEM $68 (47) ~$68 | ~$51 | $50 (2) ~$48 | $59 (27) ~$54 | ~$24 | ~$17 |
| Fair | — | $46 (2) ~$51 | ~$38 | ~$35 | $35 (4) ~$41 | ~$18 | ~$13 |
| Poor | — | ~$37 | ~$28 | ~$27 | ~$30 | ~$13 | ~$10 |
$X (N) — Median sold price (N sales)
~$X — Guide price
This item
$X (N) — HP Calculator (platform)
Guide prices based on 85 sales, Good/Fully Working baseline ~$67.
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Compare to HP Calculator platform aggregate:
