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I dislike electric salinometers (if people use different salts, it could throw it off!). I'm not using a straw, rather a dropper pipet flipped over with sand in it, and am doing quite well.

jlamslam wrote: ↑January 18th, 2020, 12:27 pm Anyone have any tips on making an accurate salinometer? I'm having trouble marking accurate lines on the straw. Is an electric salinometer better?

I believe some of the older Water Quality forums have some suggestions and ideas, although I cannot find them at the moment. One has a picture of a pipette salinometer similar to the type BennytheJett is describing. I find it helpful to find a Sharpie you are willing to sacrifice so you can mark it while it is floating(it tends to be rather hard on the Sharpie, though).

What does it mean by "There are no restrictions on size except that the team must build the device to operate within a standard 400-600 ml beaker"? Is it saying that the device has to fit within the beaker or only some part of the device has to be in the beaker?

Blank25 wrote: ↑January 20th, 2020, 8:53 am What does it mean by "There are no restrictions on size except that the team must build the device to operate within a standard 400-600 ml beaker"? Is it saying that the device has to fit within the beaker or only some part of the device has to be in the beaker?

Only some part. It just means you shouldn't have to pour the water out to test it or something.

Do we need to be able to identify the marine indicators on the rules as well as the macroinvertebrates listed on Scioly wiki?

Reckless57 wrote: ↑January 25th, 2020, 8:19 pm Do we need to be able to identify the marine indicators on the rules as well as the macroinvertebrates listed on Scioly wiki?

Rules are the official source, some parts of the wiki may be slightly outdated, use the organisms provided in the rules to study. They’re not the same organisms?

SilverBreeze wrote: ↑January 25th, 2020, 10:06 pm

Reckless57 wrote: ↑January 25th, 2020, 8:19 pm Do we need to be able to identify the marine indicators on the rules as well as the macroinvertebrates listed on Scioly wiki?

Rules are the official source, some parts of the wiki may be slightly outdated, use the organisms provided in the rules to study. They’re not the same organisms?

Yeah, the macroinverts are from last year

hmmm wrote: ↑January 25th, 2020, 11:07 pm

SilverBreeze wrote: ↑January 25th, 2020, 10:06 pm

Reckless57 wrote: ↑January 25th, 2020, 8:19 pm Do we need to be able to identify the marine indicators on the rules as well as the macroinvertebrates listed on Scioly wiki?

Rules are the official source, some parts of the wiki may be slightly outdated, use the organisms provided in the rules to study. They’re not the same organisms?

Yeah, the macroinverts are from last year

Thanks!

Okay so I am trying to use the pipette with sand method for my salinometer, but for distilled water (0% salinity) and 2% salinity, there is no difference. Does anyone know what may be going wrong?

Scrambledeggs wrote: ↑January 31st, 2020, 7:53 pm Okay so I am trying to use the pipette with sand method for my salinometer, but for distilled water (0% salinity) and 2% salinity, there is no difference. Does anyone know what may be going wrong?

It seems dumb, but you might want to use a thinner pen. Also might want to check your lab technique. It's easy to mess up a calibration solution.