| Brand | HP |
|---|---|
| Model | 28S |
| SN | 2932A06479 |
| Country of Origin | United States |
| Vintage | Yes |
Check the listing for details. HP 28S Advanced Scientific Calculator. Condition: Used, Made in United States. Listed at 125.00 USD. Photos are of the actual calculator being sold. The modified battery door provides better battery conductivity than the steel plate in the original plastic door, is less stressful to the battery door socket, and will not break like the original, but doesn't look as nice.
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