5.0 out of 5 stars Really helped my Sea-Monkey Colony.

K.M. · May 11, 2025

(function() { P.when('cr-A', 'ready').execute(function(A) { if(typeof A.toggleExpanderAriaLabel === 'function') { A.toggleExpanderAriaLabel('review_text_read_more', 'Read more of this review', 'Read less of this review'); } }); })(); .review-text-read-more-expander:focus-visible { outline: 2px solid #2162a1; outline-offset: 2px; border-radius: 5px; } 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.

5.0 out of 5 stars For the price, it seems to work.

T. · May 26, 2025

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.

5.0 out of 5 stars Easy To Use and Very Accurate

E. · May 4, 2025

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.

5.0 out of 5 stars It works!

M.S.I. · April 13, 2025

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

4.0 out of 5 stars Be sure to calibate it!

S.N. · February 20, 2025

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.

5.0 out of 5 stars Works properly

t. · April 6, 2025

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

5.0 out of 5 stars Works as expected

L.G. · April 8, 2025

Works as expected

5.0 out of 5 stars 5 stars down the board and I never do that!

R. · March 18, 2022

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 Bolo.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+++

Works fantastic!

A.P. · October 27, 2024

(function() { P.when('cr-A', 'ready').execute(function(A) { if(typeof A.toggleExpanderAriaLabel === 'function') { A.toggleExpanderAriaLabel('review_text_read_more', 'Read more of this review', 'Read less of this review'); } }); })(); .review-text-read-more-expander:focus-visible { outline: 2px solid #2162a1; outline-offset: 2px; border-radius: 5px; } Great tool to have with your saltwater set up, works wonderfully! Exactly as expected

Inaccurate

M.B. · October 13, 2020

Reading completely inaccurate, how can I return this item?

Love it

L. · January 3, 2025

It's just very nice good price love the quality.Not much else to say it does it's job.

Great tool - but calibrate regularly (with calibration fluid)

S. · November 9, 2024

Way better than hydrometer. Get some calibration fluid and check it at least every few weeks (or if you get a weird reading). Once calibrated back (takes a few seconds) - it's good again. Calibration helped me from not adjusting my salinity when it wasn't necessary. For the price - great tool.

Accurate, affordable

C. · November 11, 2023

I was skeptical for the price, but it’s very accurate and it’s literally the same one that the local store sells for $90. Excellent option for my saltwater tank. 10/10 would recommend