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Texas Instruments TI-81 Calculator View Screen & Polaroid T691 Projector In Case - Picture 1 of 11
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Texas Instruments TI-81 Calculator View Screen & Polaroid T691 Projector In Case

YesterdayandToday-8
  • (1482)
US $29.95
Condition:
Used
“Great shape.”

Additional service available

Shipping:
US $18.05 Standard Shipping. See detailsfor shipping
Located in: Lewisburg, Ohio, United States
Delivery:
Estimated between Tue, Jun 4 and Sat, Jun 8 to 43230
Delivery time is estimated using our proprietary method which is based on the buyer's proximity to the item location, the shipping service selected, the seller's shipping history, and other factors. Delivery times may vary, especially during peak periods.
Includes 5 business days handling time after receipt of cleared payment.
Returns:
Seller does not accept returns. See details- for more information about returns
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eBay item number:265754545219
Last updated on Jan 02, 2024 18:39:57 PSTView all revisionsView all revisions

Item specifics

Condition
Used
An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. See all condition definitionsopens in a new window or tab
Seller Notes
“Great shape.”
Modified Item
No
Country/Region of Manufacture
Unknown
Custom Bundle
No
Display Size
Regular
UPC
0033317073122
Brand
Texas Instruments
Key Size
Regular
Type
Graphing
Power Source
Battery
Size
Handheld
Model
81
MPN
TI-81

About this product

Product Information

Engineered for use for algebra and pre-calculus, the TI-81 graphing calculator is a must-have for students. This Texas Instruments model features a 96 x 64-pixel display and built-in software to enter advanced functions.The TI-81 display is large enough to show eight lines. Each line can be up to sixteen characters long. The number result of the calculation is displayed on the following line of the display. There is also plenty of room on the display to show the resulting graphs, and for more detail, you can use the zoom menu. You can adjust the brightness of the display based on the type of contrast you would like.Because of the calculator's built-in memory, you can enter and save up to 37 of your own programs. The memory also enables several features that can save you time. Among those features is the last entry option, which you can use to build on the previous result to save time in your calculations. To access the last answer menu, just press the 2nd key along with "ANS." The keyboard layout is user-friendly and allows you to quickly locate the most common keys for scientific calculations. Keys on the keyboard are grouped by color and function below the display. There are areas for each mode: editing, graphing, advanced function, and scientific calculator keys. The most common commands can be completed with the press of a key. You can access the second set of commands on the keyboard by using the 2nd key. Editing expressions right on the display is simple. Just press the insert or delete key, or press a cursor-movement key to navigate on the screen. Navigating between menus is simple as well. Just press the key associated with each menu.This Texas Instruments calculator is perfect for using to enter data for graphs. The calculator is capable of graphing up to four functions at a time. The memory allows you to save your complex calculations and information you've entered for later use with a simple stroke of a key. The Texas Instruments TI-81 model can perform one and two-variable statistical analysis. You can enter numbers on the keyboard in scientific notation too.The TI-81 calculator provides all the essentials found in other versions, such as all the key software and features of graphing calculators. TI-Basic code is still used. It keeps this standard item affordable and as functional as other calculators.Taking this calculator on the go is no problem, thanks to its compact design and protective slide case. The display will remain protected even in the roughest of backpacks. Two different types of batteries are used. There are four standard size AAA batteries with a lithium battery for backup.The Texas Instruments TI-81 calculator is perfect for the student in your life. Make your mathematical problems easier with this product, or help someone else get an advantage on homework by gifting them this calculator. The perfect complement to a full computer, the TI-81 has all of the information you'll need for a quick start to any math class.

Product Identifiers

Brand
Texas Instruments
MPN
TI-81
UPC
0033317073122
Model
81
eBay Product ID (ePID)
54843142

Product Key Features

Power Source
Battery
Size
Handheld
Key Size
Regular
Type
Graphing

Additional Product Features

Display Type
Large
Additional Features
Case Included
Digit Display
16 Digits

Item description from the seller

YesterdayandToday-8

YesterdayandToday-8

99.5% positive feedback
3.3K items sold
Visit storeContact
Joined Jul 2017
Usually responds within 24 hours

Detailed seller ratings

Average for the last 12 months

Accurate description
4.9
Reasonable shipping cost
4.9
Shipping speed
5.0
Communication
5.0

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Product ratings and reviews

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4.4
63 product ratings
  • 45 users rated this 5 out of 5 stars
  • 8 users rated this 4 out of 5 stars
  • 4 users rated this 3 out of 5 stars
  • 4 users rated this 2 out of 5 stars
  • 2 users rated this 1 out of 5 stars

Good value

Would recommend

Good quality

Most relevant reviews

See all 57 reviews
  • by walguzm
    Oct 28, 2022Top favorable review

    Nice size with clear view of the screen

    Great calculator to use for basic and Intro to Algebra. Easy to use also has a clear screen to see well. The size just right to handle!

    Verified purchase: YesCondition: Pre-OwnedSold by: b.g.clummox

  • by chakita1025
    Sep 21, 2016Top critical review

    Not terrible and does work and really cheap

    I like this calculator and the price and all, but sometimes the thing won't turn on even with the batteries in there. I've been thinking something's wrong with it but it takes too long for it to come back on and also the screen can be very hard to see sometimes, you have to constantly keep changing display in order to meet the room your in

    Verified purchase: YesCondition: Pre-OwnedSold by: mmpire2016

  • by joeythe79
    May 26, 2020

    Speecheless quality for the price

    The calculator has almost no scratches, the screen displays all pixels, comes with everything, no engravings, and no wear on the buttons, all for $6. I could not recommend this anymore.

    Verified purchase: YesCondition: Pre-OwnedSold by: anewbeginnings13

  • by bigkahuna132
    Nov 03, 2020

    The 81, the most straight forward grapher

    The 81 is great for your student who is getting their first graphing calc. It is also good for more advanced functions as well. It is simple to use, more straight forward than any other I have used. As I mentioned, it will get you through your trig and basic calculus. There are other more advanced models if you are going further into the sciences - though this one will work - if you take it that far with the 81, it surely will - because you can make it work. If you want the expanded stats/chemistry/etc functions - you will need a little higher model, though if you know your way around the 81, you should be ok.

    Verified purchase: YesCondition: Pre-OwnedSold by: trading.post.23

  • by gtce5851
    Oct 15, 2022

    works as advertised

    The calculator works, the keypad and display are in good condition. Though in my opinion the TI-81 itself (feature wise) is kind of mid.

    Verified purchase: YesCondition: Pre-OwnedSold by: cyberquipment

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