Best company I have ever dealt with. Small company that has tremendous service department and response. I have my ESMA E789 for almost 30 years in my Dental Office to clean our instruments which are in cassettes, prior to placing in our autoclave. It runs great automatically and only had minor switch or fuse changes basically throughout all this time. I would recommend this company to any Dentist or Doctors office needed a built in worry free ultrasonic cleaning unit prior to sterilizing.