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  1. General Reef Discussion
    Well after much of my own research online:read: but not much personal experience, I decided to come to you guys for the answers. Which do you use? A Hydrometer or Refractometer I know refractometers are generally viewed as more accurate. I would like to hear from people using both who are...
  2. General Reef Discussion
    I use a Sera Marin densimetre to control the salt levels. It is at 1023 constantly. However have today used a refractrometre from a friend and it showed 1026. How is this possible? I assume refractrometre is more reliable but 3 points difference is huge. Any help? Cheers. :help:
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