HP · 82182A
The Time Module gave the HP-41C and 41CV a clock, a calendar, a stopwatch and alarms. Its manual was first printed in January 1982, though NASA's Shuttle crews were already carrying 41Cs with a pre-production time module. The alarms are the clever part: one can switch the calculator on and run a program, so a 41 could take readings on a schedule with nobody there. HP rated the crystal time base at about three seconds a day at room temperature, with an accuracy factor you can set to trim the drift. In 1983 HP built the whole thing into the 41CX, which is why a CX listing with a Time Module thrown in is padding. Buy one for a C or a CV.
Module check
Should come with it
Contacts are the main risk on any module. Check it keeps time, since HP rates it at about three seconds a day.
Choosing modules for a 41? The HP-41C, CV and CX explainer covers memory, ports and what each model has built in.
Buying guide
We'd buy vintagecalculatorsinc's Time Module titled works perfectly at $141 delivered, since the photo shows the manual, an overlay and the quick reference card with the module. It's for the 41C and 41CV only, because HP built the clock, calendar, alarms and stopwatch into the 41CX, so don't buy one for a CX. There are at least 7 for sale at $141-239 delivered, too few for the $162 median to be more than a rough guide, with bare modules asking $162-180 and the full kit with manuals and overlays $239. Ask for a close photo into the module's open end and whether it kept time over a day, since HP rates it at about three seconds a day. Skip o-skoo's $78 listing unless the seller confirms the module is in it, since the photo shows only a manual.
$140.99est. delivered
The lowest delivered listing that clearly includes the module, at $141, titled works perfectly. The only cheaper one shows just a manual.
HP TIME MODULE HP 82182A FITS HP- 41C HP-41CV HP-41CX WORKS PERFECTLY
$140.99est. delivered
Titled works perfectly, with the manual, an overlay and the reference card in the photo, at $141 delivered from a 100% seller, about $20 under the median. The bare modules here ask more.
HP TIME MODULE HP 82182A FITS HP- 41C HP-41CV HP-41CX WORKS PERFECTLY
Delivered prices include shipping as eBay quoted it to a US address on Oct 15, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Snapshot
Checked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 15, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used$140.99est. delivered
$135.00 + $5.99 shipping
Buy It Now$135.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Good buy
Titled works perfectly. Manual, overlay and reference card in the photo.
Seller: vintagecalculatorsinc
100% positive
Used$153.99est. delivered
$150.00 + $3.99 shipping
Buy It Now$150.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Module with its owner's manual. No test claim.
Seller: leo.merchant
100% positive
Used$161.95delivered
$161.95 · free shipping
Buy It Now$161.95
Our take
Module only. No test claim.
Seller: sfg_sports
99.9% positive
Used$179.99delivered
$179.99 · free shipping
Buy It Now$179.99
Our take
Module only, 82182A label in the photo. No test claim.
Seller: tech_revived
99.9% positive
Open box$238.79est. delivered
$229.99 + $8.80 shipping
Buy It Now$229.99
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Our take
Module, manuals, overlays and cards in the photo. No test claim.
Seller: yellowbrickfinds
99.9% positive
Used$78.17est. delivered
$70.00 + $8.17 shipping
Buy It Now$70.00
Check the seller
Photo shows only the HP-41 Extension Module manual. Ask whether the module is included.
Seller: o-skoo
99.6% positive
Used$188.82est. delivered
$183.00 + $5.82 shipping
Buy It Now$183.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Check the seller
Same title wording as another seller's, and the photo shows only an overlay. Ask to see the module.
Seller: jasping
100% positive
Prices change daily. The live eBay search shows everything listed now, including anything new since Oct 15, 2026.
See every listing on eBay ↗eBay searchHP
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