Inaccurate By Doug on 1/23/2016
Doug wouldn't recommend this product to a friend
I've had four bottles of this stuff and only one has actually been accurate. I recently purchased another Pinpoint salinity monitor and the fluid that came with it reads about 30ppt on my refractometer and 43mS on the monitor. Be careful!
concerns about evaporation By DavidC on 12/8/2014
DavidC would recommend this product to a friend
I've used RO/DI water to calibrate but heard using a solution at a specified density.
So I got it and found that the difference between the RO/DI and this solution is about .01
I'll use the solution but make sure its' container is tightly shut because if there is any evaporation, it would definitely affect the results
SOLID By Evan on 8/29/2014
Evan would recommend this product to a friend
If you're calibrating a refractometer or pinpoint salinity monitor this is an absolute must. Fluid can be reused. 53.0 mS = 35.0 ppt.
The only thing that I wish pinpoint did was make make the opening on the bottle large enough to slide the pinpoint salinity monitor probe into.
Does what it supposed to do By Awais on 4/18/2013
Awais would recommend this product to a friend
It does exactly what its supposed to do. Its a good idea to calibrate every month or so.
Starting a salt tank? Get This By Chris on 9/28/2012
Chris would recommend this product to a friend
I had a refractometer from previous projects and had always calibrated it with distilled water. After having some issues with my tank, I decided to take out all the varibles of what could be wrong. It ended up that my refractometer was way off. Get this solution and start your tank on the right foot.
happy, and not By Timothy on 8/27/2012
Timothy would recommend this product to a friend
I'm happy that is fluid is exactly what it says it is. Calibrated at 53 ms = 1.026 SG = 35 ppt.
Not so happy that I discovered my refractometer (calibrated with RODI at 1.000) was more than 5 ppt off. Time to correct the salinity in the tank!
Must have By Scott on 2/14/2012
Scott would recommend this product to a friend
I bought this just out of curiosity, I had been calibrating my refractometer with ro water and wanted to see how accurate it really was. When I recieved and tested my refractometer I was astonished, it was almost .01 off. I was running my reef tank at much lower salinity than I had thought. Youll never run out once calibrated you can just make a batch of salt that is the salinity you like and refill the bottle.
Overpriced By Join the Revolution on 10/15/2011
Join the Revolution would recommend this product to a friend
The people at Pinpoint raised the price of this calibration solution as of 2007. The solution was $1.99 then $2.99, then all of a sudden went up to $8.99. I wrote to the Pinpoint and they responded that "frankly, we can raise the price since we are the only ones making this" Therefore, out of principle i stopped buying their calibration solution. I make my own. 1 gallon for less then a couple of cents, get a refractometer and make up your own. create it set it to 1.023. The product works as intended, but its just salt water that is accurately calibrated, which you can do your self.
Saved my tank By John on 7/22/2011
John would recommend this product to a friend
I was calibrating my refractometer with RO/DI water, and kept having all kinds of trouble with my tank. Once I started calibrating with this stuff, I raised my salinity and have been keeping it steady at 1.025.
Must have By Todd on 8/17/2010
Todd would recommend this product to a friend
You really need to calibrate your refractometer with solution. Don't use ro/di water, it is too far down the scale to be accurate. As covered by Randy Holmes-Farley.