There are a lot of used lab equipment dealers, they test and stand behind what they sell. All professional equipment, doctors use them all the time. There are just a few products that require doctors lic. And those pieces are the ones that are restricted. They sell huge amounts, so very safe. These are not fly by night or knock off china crap. And don't think amazon is safe, every time you order from them all of your info from past purchases are compiled into huge data bases. Which are data mined and sold. Even the items that you only look at are put in you profile for targeted advertising. J