Bio Energy Tester, Biosensor , Biotensor??

What is the difference between a Bio Energy Tester, a biosensor and a biotensor?
There is no functional/technical/quality difference and we offered these products under the name Biotensor until december 2013. Then however we received a claim from a German company that has registrered the name biotensor. This resulted in us not being allowed to use the name biotensor or Biosensor for our products.