I have nothing to comment too much ... I have been collaborating with the Eakins Microscope Store for a long time. Over the years we have always received a high level of understanding and collaboration from EMS. If something cant not work (it happens, not EMS is to blame) to the required parameters, EMS immediately sent at his expense the respective part ... I received the package in excellent condition, everything was in place. I haven't tried what I bought, but I know that if something doesn't work ... it will be replaced by EMS immediately. Thanks EMS .....................