Calibration Standard Question

[Darth Vedder]

I have the phosphorous standard for the UL Posphorous checker and it's the two sealed cuvettes, but I just got the nitrite checker and standard, and those two cuvettes have thick rubber shrink tubing sealing the lids in.

With the rubber the lid of the checker won't come close to closing. I was able to get an acceptable result with the top open, but is this how they are supposed to be?

[xp964]

Hello,
Well, that's apparently new, because that's now how they were coming in before. I grabbed one from the warehouse and it had the same thick rubber on them.
(1) I have sent a request to Hanna Inc. regarding this, and am awaiting a response.
(2) I tried using them without removing the rubbing sealant, and found it unnecessary to close the Checker cap to get an accurate reading of the standard. The black sealant blocks the light, so you don't need to close the Checker cap.

However, I still found it kind of odd, so I'll let you know what Inc has to say about it. I imagine the reason for the black rubber is to prevent the cuvets from being opened or leaking, both to ensure purity of the standard and to minimize unnecessary exposure chemicals.

Thank you,
Hanna USA

[Darth Vedder]

Thank you, and I look forward to what they have to say. It just seems a little ghetto, and the same could have been achieved by sealing the cap another way

Thanks for the response

[Darth Vedder]

Any official word bak from Hanna?

[xp964]

I'll remind them, they were supposed to get back to me this week. My contact needed to talk to the VP of R&D about it, and he wasn't in last week.