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Give your black-and-white documents a polished, professional look. The HP 21 cartridge is perfect for low-volume users who want laser-quality text and graphics. Features include:
- Print professional-looking documents with laser-quality black text.
- Reliable—print crisp text every time with your HP printer.
- Simple to install and easy to use.
Initial HP printer compatibility:
- HP Deskjet 3910
- HP Deskjet 3930
- HP Deskjet 3940
- HP Printer/Scanner/Copier 1410
What's in the Box
One HP 21 Black Inkjet Print Cartridge
 Customer Reviews 
Replacement Ink
Rating: 3
As far as replacement cartridges...well, they work well, and they certainly fit the machine we have, but I wish they weren't so darn expensive. We go through them more like water than ink....and spend a fortune during the year replacing them when they run out. When buying both color and black/white cartridges together, it can cost 40 dollars each time I replace them, and during school months, we could spend up to 800.00 for the year...4 cartridges a month estimate...egads!
Good Brand, Good Price, Good Quality
Rating: 5
I have to disagree with people that think they aren't getting their money's worth on ink. I have an Officejet 4315 that I use to print several pages per week for school. I also own an Inkjet 697C. Yes, the 697 cartridges have twice as much ink, but they are also twice as expensive at around $25-30 each. I simply changed my default print setting to Draft, which prints 300 dpi, and it prints B&W text just as nicely as the Normal setting (600 dpi). You may not want to do this if you print work/professional graphics all the time, but I used the Draft setting on color for printouts for my Anatomy & Physiology II class last semester, which worked just fine. 1 black ink cartridge (HP 21) on the Draft setting will last me most of a school semester, printing 10 - 20 pages per week (of mostly text with a few graphics). I used 1 plus a partial color cartridge (HP 22) last semester.
very good--but it'll run out of ink a little too fast
Rating: 4
This HP 21 inkjet cartridge is very light, easy to install and allows the printer to print out very good quality, durable black ink on the page. It stores for about a year after you buy it so if you want to stock up for your office or personal printing needs that's great! (It even comes with an expiration date!) HP also packs it well so that it is difficult for the cartridge to become damaged during transit.
One thing that I didn't like, however, is that the ink can go quickly. If you print a lot, you might even need to replace this cartridge every ten days or so. My needs are about 15 pages per week and I have to change the cartridge roughly every five to six weeks. That's not good; although to be fair to this HP ink cartridge I am printing graphics.
Four stars for being great ink in an easy to manage and install cartridge. It loses a point for not lasting longer.
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