Best voltage meter?

Hello Looking for the best battery metrr seen lots here but unsure which is the best? My battery is going to be 12s Thanks

afaik most people use this one: (or the green version)

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I have the 1st listed above unfortunately its percentage readouts are useless for my 30q pack. They are fairly accurate to start with, but become increasing inaccurate the more i discharge(Reporting ive much less range than i actually have). So now I use the discharge curves from the samsung specsheet and, to enter my own voltages/percentages into an app for accurate readings. I charge with a balance charger, so i know this method is accurate.

I stop riding for a few minutes to get an accurate reading too. If anyone knows of one you can calibrate discharge curves yourself please let me know.