Bad Pinpoint Salinity Calibration Fluid

[-Logzor]

Has anyone gotten a bad bottle of Pinpoint brand salinity calibration fluid?

I had calibrated my pinpoint probe using this stuff awhile back. I recently tested water from two different online vendors, both read very low according to my probe. The bottle had been completely new, unopened, and full.

So I found a bottle of another brand calibration fluid. It turns out this one is reading way lower, just like the water from the vendors I had ordered from. My salinity wasn't terribly high but I was surprised that the fluid was so inaccurate.

Has anyone else had a similar problem?

 

[BarbH]

:bump:

 

[CJO]

I haven't personally, but I did read about it happening a few years ago on another forum.

CJ

 

[dknuckles]

The calib sol. Does go bad! I have experienced this myself.
It should be labeled w/ a date should be tossed if older that 2yrs from Manu date or if @ expiration date.

 

[-Logzor]

I asked Jeremy at PA to test a few bottles for me, I wonder how old the stuff was. I've been struggling with salinity issues for the past year now. First it was issues with my refractometer, I upgraded to a Pinpoint probe only to get a bad calibration fluid with it. I'm glad I had the second bottle, which was Sybon brand, which appears to be the accurate one, as the readings concur with the measurements from two separate vendors.

 

[shred5]

I have two that are different. I think even sealed bottles have some evaporation and one of mine was old. My old one read much higher than my new one.

 

[myzislow]

The pinpoint stuff always went to crap one me very quickly. I don't think the cap seals very well.

I've been using the aquacraft stuff with much better and consistent results. Much more user friendly bottle and applicator as well.