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Simply, we've developed a better method of measuring pH, ammonia, and dissolved oxygen: optical sensors.
Checkout the video to the right. This is an "under the hood" look at one of our alpha test units as it's taking pH readings. You can see it lighting up periodically. This is it taking color readings of the pH patch. We do a similar process for ammonia and DO.
What makes optical sensors superior to electrical is twofold: price and recalibration (or lack thereof). Electrical sensors can get pricey, especially for DO. Photochemical sensors are significantly less expensive and can be inexpensively replaced after their lifespan has expired. No need for recalibrations.
It's taken us a ton of work to adapt these technologies for use in aquaculture, aquaponics, and hydroponics, but we're nearly there. Stay tuned for more updates!