rossco Posted December 30, 2005 Report Share Posted December 30, 2005 A sharing...from a newbie! I have been quite happily mixing my SW and doing other such stuff using a swing arm type hydrometer. I wasn't happy with the 'non-performance' of some of my introduced livestock so bought another swing-arm to check against the first - it read 0.005 different! (higher). 'Checking' with a floating hydrometer gave a (recalibrated) measure in between! Eeeek! Time to go down to our local SW shop and get them to test with their refractomter. It said my SW was 0.004 higher than what I was aiming for. So over the last couple of days I have been gradually diluting my tank down aiming for a 'real' 1.024. (0.001 a day) I am hoping it will stop the fishies blinking so much. :oops: Another lesson for a newbie...don't believe anything... Quote Link to comment Share on other sites More sharing options...
cracker Posted December 31, 2005 Report Share Posted December 31, 2005 The only safe way to measure Salinity is to buy a refractometer. These are as accurate as anyone needs to go and are reliable. Quote Link to comment Share on other sites More sharing options...
rossco Posted December 31, 2005 Author Report Share Posted December 31, 2005 Yup - agreed. Do you know how many swing arms are getting used every day? I guess my conclusion would be that if we are going to 'rely' on a swing arm or similar get it benchmarked with something like a refractrometer and get it checked regularly (I'm making a case for how 'cheap' refractromters end up being aren't I?!!!?) Salinity is a big fundamental to get wrong...and perhaps keep getting wrong... Quote Link to comment Share on other sites More sharing options...
slappers Posted December 31, 2005 Report Share Posted December 31, 2005 hmm reef was selling one ?? 120$ i think Quote Link to comment Share on other sites More sharing options...
skuzza Posted December 31, 2005 Report Share Posted December 31, 2005 Saw one for sale think it was reefs on trade me for $70.Used but that dont matter. Quote Link to comment Share on other sites More sharing options...
slappers Posted December 31, 2005 Report Share Posted December 31, 2005 all be sorted now Quote Link to comment Share on other sites More sharing options...
CanadaReef Posted December 31, 2005 Report Share Posted December 31, 2005 I bought one off of ebay.com, and it was $30 US$ + shipping, best way to measure salinity !!! Quote Link to comment Share on other sites More sharing options...
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