What is Reddit's opinion of PH Pen Tester,THZY High Accuracy Pocket Size PH Meter with ATC (Automatic Temperature Compensation) Backlit Light LCD 0-14 pH Measurement Range, 0.01 Resolution Handheld pH Pen Tester?

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Sorry. The PH meter I use is at amazon at {amazon link](https://www.amazon.com/gp/product/B00XN4111W/)

Even with that, I think my pH meter just generally sucks. It's this one:

https://www.amazon.com/gp/product/B00XN4111W/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

I ended up getting this pen from Amazon

Amazon Link to Product

I have used the drops before but it gets difficult to read especially when your nutrients add to the color.

This is the drops that I used to use link

I got this one for under $20 and it works great.

http://www.amazon.com/gp/product/B00XN4111W/ref=crt_ewc_title_dp_2?ie=UTF8&psc=1&smid=A2YTRVUK78832Q

CO2 drop checkers are usually delayed by 1-2hrs. This is one reason why planted tank experts like Tom Barr always advocate against them. It's much easier to get a ph reading from an electronic ph test meter. In fact they're not as expensive as you might think, Amazon has some good ones for under $20.

https://www.amazon.com/dp/B00XN4111W/ref=cm_sw_r_cp_api_OO.DybY26DBRH

In addition, you should refer to a ph kh chart to get a good idea of how many ppm your water really has. >40ppm tends to begin affecting fish