Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium 0-100 PPT with Automatic Temperature Compensation

About a month ago, I was down to zero Sea Monkeys. I siphoned out about 75% of the water and ran it through a coffee filter, then let the tank sit.A week later—surprise! Hatchlings. These eggs were clearly dormant and just waiting for the right moment. Only two made it to adulthood, but I kept seeing new babies that didn’t survive past the first week.Today, I tested the salinity with this refractometer and found it was too low: 1.008. To fix it, I made a 1-ounce concentrate of kosher (non-iodized) salt water and added it slowly using a pipette, checking levels along the way. I brought the salinity up to 1.015, which put both the salt level and water level right where they should be.Since evaporation could raise it naturally to 1.016–1.017, I’m now in the ideal range for adult Sea Monkeys. I’m hopeful the six babies I see now will finally make it past the critical first week- and I’m pretty sure the adults feel like they’ve just come back from a spa day.

This thing was so inexpensive and it seems to be accurate. Only thing is that it loses calibration quickly. Not sure why. Does the screw come loose just sitting in the case? I just calibrate it quickly with some calibration solution. Kinda annoying, but hey this thing was so inexpensive.

My fish are happy and healthy. I was scared that this would be hard to use since I just started keeping fish, but it is very simple and easy. I don’t know how easy it would be to use with glasses, but I couldn’t say. Very quick and definitely more trustworthy than other brands.

It’s inexpensive and works great! Everything seems to be of good quality, no complaints at all!!

The directions even tell you so. It needs to be calibrated pretry much before every use. I use calibration fluid and then verify by checking distilled water. I has to tune mine down about .12 for it to be correct. Only giving 4 stars because deoending on how the light is shining into it, it can be tricky to read.

Works well, exactly as it should. Make sure to calibrate with RO water before using.

Works as expected

This tool is now indispensable to me.I use this to test the water for my brine shrimp.I make small frozen brine shrimp cubes with those silicone molds/trays I get here on Amazon.My fresh water fish, no matter the size of my hand or as small as a neon tetra love them and they are more colorful than just feeding flakes.Being on a tight budget, I did not get calibration solution.I tested tap water, distilled water and bottled water and the tap water and distilled were were the same. The bottled water was a bit higher so, I calibrated with distilled water heated to 79 degrees F.I hatch my shrimp in ~25 - 30 just under 1.020.About 5 tablespoons of regular sea salt in just under a gallon of tap water with a touch of stress coat.I can easily and quickly check that my water (kept at 79 degrees F) is right on with this tool.My shrimp start hatching in ~12 hours under bright LED lights that are continually on.At 24 hours I put about 10 grains of Caputo yeast in with them and harvest at ~36 to ~48 hours based on my schedule. I prefer 48hrs the shrimp are a little bigger.I have in fact raised them to a week old but, it's just not as efficient for me and requires maintenance.I use the same water twice, two batches of shrimp, after re-checking and adjusting water when needed.After two batches in same water, I replace the water with fresh.My harvests are great. I get about 40 cubes of pure shrimp (sucked up with a 2ml dropper right from shrimp net after rinsing) per ~3/4 gallon jug. (I use inverted gallon jug shape of a bleach bottle).After I get all I can out of net with the dropper, I swish the net in fish tank and the fish go nuts gobbling up the remaining hundreds if not thousands of live swimming shrimp I could net get out with the dropper!My hatch ratio is great and I depend on this tool to provide repeatable consistency.A+++