There is no technical difference between the 4 models - Pro, Standard, Vet Pro and Vet Standard. The website lists 3,000 hours as the diode lifespan for the Pro model vs 1,000 hours for the Standard model which I felt justified the $100 price difference. However, when I received the Pro model, the manual listed the diode lifespan to be only 1,000 hours. I contacted the company asking them to correct their website and refund me $100. They have ignored my 2 emails and one v.m..
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