🌊 Advanced ATC Salinity Refractometer for Aquariums, Marine Monitoring, and Saltwater Testing. Dual Scale: 0-100ppt & 1.000-1.070 Specific Gravity Review

Excellent price. Works perfectly. From time to time an adjustment is needed, very simple, add a few drops of water to Rodi, turn the knob until you see 0, delete Rodi, a few drops of water from the tank and you're golden. Just keep your tools clean.

I had to calibrate right away, which is not uncommon, but I didn't have a screwdriver. Now the calibration is fine and the scale when you look at it might be a bit bigger, smaller and more complex, worried about how accurate it is, I have no idea, I don't have another one to compare it to

So simple and easy to use with no batteries or electronics to fail after a few uses. I tested a shallow well very close to a saltwater inlet that brings saltwater into my yard with the tides. no salt In order for the meter to work, I added salt to my test sample and the meter showed accurate results. Very solid construction, I'm sure this refractometer will last a long time, good investment for $22.

I bought an htis refractometer a while ago to grow Artemia for my aquariums, but only recently have Artemia. So I finally tried this brand new refractometer in the box but it doesn't work. I've used refractometers in the past, but this must be defective. It doesn't show blue, which is difficult to understand because the field where the water drops settle (daylight panel) is dark blue, so I don't know why the lens doesn't see it. It must be defective. Unfortunately, I'm way behind on the returns