What kind of thermometers and hydrometers are you using?
To post a picture you can use a photo hosting site like http://flickr.com/
Once you make an account and log in, there should be an upload photos button. Once you upload the photo, click on the thumbnail of it, right click the big picture and click "Copy image location". Then just paste that link into your post. Or you can click the yellow button with the mountain (the insert image button) and copy the URL into the box provided.