Blue Lab runs a dealership program that's geared around training retail stores and staff the importance of ph/ec, cleaning and minor repairs. We're given a special tool that connects to any popular ph probe with a BNC connector, or conversely connects to the Combo, Guardian, or PH meter (not the pens), and it'll do some diagnostic work for us. I was trying to find a picture of it online (day off work wee), but cna't find one, it' s a really neat tool lol
We're basically trained to do a lot of the work that blue lab would have to do if every meter had to be sent back to them. We're able to sniff out bad meters, bad probes, that sort of thing. And our RMA's get processed and returned faster than say a non certified retailer.