My model 449 starrett depth mic turns hard, how can I fix this?

Ask the maker direct. It is nowhere to be found online. Sears is full of doom and gloom. No battery cover with a small screw hold it on?

https://www.searspartsdirect.com/model/32gq2a0k8i-003107/starrett-d34-16-home-parts

It should be here

https://www.google.com/search?q=starett+digitape+replace+battery

Starrett User Manuals

Starrett https://www.starrett.com > documentation > user-manu...
Starrett Product User Manuals. CP505E-12 Electronic Protractor User Guide - Form 970M .PDF, 4841 MB. Combination Square Insert - Form 955 .PDF, 4056 MB.

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im not too sure what your asking, all imperial starrett id mics read 3 place decimal you will have the inch number that is set by you for the job and then the mic gives you the next 3 numbers IE 4.250

Are you certain the battery is installed correctly? Many electronics won't work if the battery is installed backward/upside down. Do not ask how I know this....[-:

I can't find any available manual. I have an Starrett tension guide before but It was an old model and I don't even have manual for it. Did you try calling Starrett? They might can send you one.

Sounds like you might be on the right track in thinking there is some corrosion. Do you use the micrometer regularly? Did this problem appear suddenly? Try a little WD-40. If rust is significant, i recommend using some naval jelly to remove it. Remember, when it comes to precision instruments such as this, moisture is not your friend.

Hope this helps.

Hello. Mitutoyo has both calibration and repair services if required.

Repair:

http://www.mitutoyo.com/template2.aspx?id=22

Calibration:

http://www.mitutoyo.com/template2.aspx?id=21

Hope this helps out. Thanks.

Try the starrett web site. You can chat with them there about it. The adjustments are fair easy to do.
http://www.mytoolstore.com/starrett/micro029.html

Call Starrett (978) 249-3551 they will fix you right up. 

OK, I fixed it! After hearing back from Starrett, it seems that a RENATA battery is the only one that fits right. I went out to Radio Shack and checked their stock, which turns out to be manufactured by RENATA. The new battey works fine... It did take a try or two to get the display cleared, then Error04, now it's working again.

Good luck!

--David--

Micrometers must be calibrated at 4 spots around the barrel and at zero and full scale to be truly accurate. You will have to send it to a calibration lab or back to Starrett for a full calibration because they will check it with gauge blocks of known length and verify the spindle and anvil surface flatness.

If you are only concerned with the zero and not as much about the full accuracy of the tool, then you can reset the zero yourself. With the mic fully closed (spindle and anvil touching), turn the barrel with the funky, half circle shaped wrench that came with the mic in the box. There is a little hole in the barrel where the nub on the wrench will fit then you just turn it until it reads zero. Good luck.