I have this module, but it's sitting in a drawer. Bought it over a yr ago when salinity probes for DA came out, but they apparently had problems and production stopped. They then resurfaced, but I never bought one. I had added another PC4 which put my module total at 4 ( can't add any more till upgrade ). I haven't read anything on thier accuracy, but would love to know, as eventually I would like to add one for the same reasons as you. One good thing about the SL2 is, it allows you to run another temp probe.