I have been using Bluelab flow meters and pH meters combo for several years. The biggest problem with their probe is that it cannot be fully submerged in water. This $20 probe is submersible and as accurate as the Bluelab, but costs $40 less. This probe has been used with several Bluelab products for over a year with no problems. I calibrate every 7 days and my probes (on 6 different devices) are always submerged.
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