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I've been using one a week or two. Compared with a couple calibrated refractometers to verify. Its been pretty spot on for salinity. The temp compared to my apex and rkl was about .5 degree off. Close enough and not really why I bought it.
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300 Gallon 72x36x27 AGE- 4x Ecotech XR30G5 Blue- AA PVC Hybrid Sump- Dual Synergy Shadow Boxes w Bean Animal- RO 220INT Elite- AquaMaxx cTech T3 CaRx- RD3 230- Apex- Tunze 6155, 6255 & 6150- MP40
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