The Zetium XRF by Malvern Panalytical is an awesome X-ray instrument! It is very easy to use, and easy to calibrate. It has a clear view panel so that you can see all of your samples running. You can run one sample or a series of samples at a time. The instrument is steady and so far has had very little drift. The support from Malvern Panalytical has been great. Phone support is very knowledgeable and on-site support have been helpful as well.