I will look into that likely have one laying around in the chem lab here at school. I am an English/History teacher converted into science/sped teacher so I am learning as I go. could you tell me what the difference is between those two tools?
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That works too lolActually just found out that we have these probes (Link below) for our Verneir labquest units we use in the science labs. I may be set.
https://www.vernier.com/products/sensors/sal-bta/
Both measure specific gravity but in two separate ways. The hydrometer uses a swing arm that floats at certain levels depending on the salinity. The refractometer measures the change in direction of the light passing through the saltwater to get a specific gravity reading. In my experience hydrometers are not very accurate and if the swing arm is restricted in any way your readings will be wrong. Refractometers are much easier to read and give a more precise measurement. Also refractometers can be recalibrated if needed. I believe that the salinity probe will also have to be recalibrated occasionally but I don’t know how often.I will look into that likely have one laying around in the chem lab here at school. I am an English/History teacher converted into science/sped teacher so I am learning as I go. could you tell me what the difference is between those two tools?
I think the idea of a Reef Tank in a Highschool Science Lab is great. The chemistry necessary to start and maintain a Reef Tank is really extensive. I do not know what your plans are for the tank but I can see many possibilities and learning oppertunities. If I were you I would put a call out here in R2R as well as to the manfacturers for various test kits, I know that I would be happy to send you one of my fresh as yet unused API Master Reef Kits and I have no doubt there are others who would do the same.
Testing and understanding the cycle and the chemistry of the reef enviroment would be a great way to brng practical real world chemistry and biology into the classroom, allowing the students to test the water and understand the chemistry which goes into the test as well as the results will make the lessons far more interesting than sinply a book and lecture.
ok I got some of rock today, it is mostly broken up pieces damaged in shipping I guess. Can I use this in the back of the tank in that middle compartment as a bio filter instead of buying bio balls or what not?
The other option you might think about is gluing them together to make a structureok I got some of rock today, it is mostly broken up pieces damaged in shipping I guess. Can I use this in the back of the tank in that middle compartment as a bio filter instead of buying bio balls or what not?![]()

