Reservas precompra gratuita aq – Blueming biotech
bluemingbiotech.com
It costs 700 eur and each electrode costs 10 eur (does 50 tests) and measures several parameters : NH4, NO2, NO3, PO4, pH, salinity, TDS, EC, hardness(freshwater) and density at 24ºC (saltwater).
No reagents or calibration needed.
I hope the measurements are accurate and precise. Videos will be coming out soon.