Have you double-checked your rankings either through another tool or through unpersonalized searches to see if the Moz data is correct? I have a few search terms on two of my campaigns that regularly swing from 1st one week to "Not in top 50" the next according to Moz when in reality they barely shift ever.

It may depend on how the tabs are set up. If you can see it in the page source without any problem then usually Google can too. Quick test to check: Grab a chunk of content, copy/paste it into Google search with quotes around it and see if your page comes up. If it did... then yes, Google read it perfectly fine. If not then you need to check how your tabs are hiding the content and fix it.

Two of the ecommerce sites I work on handle content on product pages using tabs to separate specifications, description, accessories and so on. Google can see all of our stuff perfectly fine as one page.

For our ecommerce sites we always make sure to have original content in our product feeds as well as our pages. That way the things from our feeds don't poach from our sites and we have a broader range of search terms covered as well as avenues to be reached through.

Your full title, Security systems | wireless | battery powered | Police Approved | CSS, winds up truncated because its 69 characters with spaces and features a few wide letters (like those W's) that make it too long pixel-wise (as William pointed out).