New hydrometer for saltwater tank. Links included. Any experiences?
I always used a floating glass tube hydrometer/thermometer combo. This link is similar to the one I'd been using.
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=7360&Ntt=hydrometer&Ntk=All&Ntx=mode+matchallpartial&Np=1&pc=1&N=2004&Nty=1
But today, I broke my 4th one in 2 years. Yes, I'm clumsy. The local pet store, which definately doesn't specialize in fish, only has this Instant Ocean hydrometer:
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=4952&Ntt=hydrometer&Ntk=All&Ntx=mode+matchallpartial&Np=1&pc=1&N=0&Nty=1
I've never used these before or known anyone to use them, but I was in the middle of a water change and needed something fast. It seemed to give readings that were different than the floating one. So which one should I trust? Any experiences with this Instant Ocean hydrometer?
I've had a few experiences with them and it seems difficult to get consistent readings with them. I'd try soaking it a while and then tapping it to get all the bubbles off and I'd get 3 readings on three consecutive measurements.
Personally, I liked the old models of their SeaTesT hydrometers (just a plastic square with a swing arm inside), instead of the different shape they're using now. I've tried the Instant Ocean, Deep Six, and Red Sea and they're all about the same. And I don't like the "ideal range" on the scale most of these use - it's not in the range for inverts, only fish.
Have to warn you though Chris - the plastic ones break too! I've broken my share of each.
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