reprinting permission of an instrument image on a website I have read about reprinting other authors tables and figures, but I couldn't find anything on reprinting laboratory instrument pictures from their manufacturer websites. Can I use instrument photos that I took from manufacturer website without permission?
You almost certainly need a copyright release in the form prescribed by your book publisher.

Track down the manufacturer's public relations office; one or two phone calls should be sufficient to find the right people. They will be very happy to supply you with pictures and the necessary copyright releases. 

If you use these instruments in your own lab and they are at all expensive, or you have a lot of them, there will be an account executive (i.e. sales person) assigned to your institution.  That person will likely be ecstatic to help you get what you need.