Blue lab ph pen

Does anyone have directions on how to use the blue lab ph pen? I understood the directions on how to calibrate using 4.0 & 7.0 solution with no problem but, there are no videos or instructions on how to properly get a read on the pen so I’m not sure if I’m doing it right. I hit the power button and stick it in the water, after rinsing off pen with tap water so the solution doesn’t get inside the water I’m trying to ph, then it takes forever to stop between two numbers but it will just keep on going back and forth.
https://www.getbluelab.com/shop/By+Application/Hydroponics/Bluelab+pH+Pen.html

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The blue lab ph pens have been known to do that… what I would do if it has a clip clip it to the back the container that the nutrients are in mix and then just give it time to settle out

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No clip but that’s a great idea!

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