Their 30 day trial is not actually a trial. Was an absolute nuisance to get a refund from this company. They claim the Loupes must be unused for them to issue a refund. How are you meant to trial them if you can't use them??? They claimed there was a deep scratch on the loupe when I sent it back, when I know for a fact their wasn't. I would stay away from these guys, these Loupes a very low quality, the magnification is poor and light intensity is not great. There's a reason why their so cheap. There is no comparison with the more renoind companies. Spend a bit more and get Loupes that'll last you years rather than a few months with these Chinese made second rate loupes.