I use drops whenever I bother to test pH. 
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Thats what mine was doing. I contacted blue lab and they ask me to send it to them so they can get a claim started. I ended up ordering an apera the same day on amazon prime because i needed a pen asap. Then, I forgot to send the bluelab in for the claim. LOL.
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Ugh! I just decided to send it back. Ordered a standard pen and just gonna go with that
If your not gonna spend the money on a bluelab or an apera you might as well just get drops. Everyone should have drops for backup anyways. Those cheap yellow ones are junk.
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I have drops as well, they work pretty darn good 
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