First Grow

Hey there Eric , well, four days isn’t much , so just try to keep the feed okay-ish by maintaining your ratios next feed or watering. What I do is use ph strips (of paper) with a precision of 0.1 which is more than enough . No calibration no breakage ! Hope this helps ! 🚀

If you've been keeping track of how much ph adjustment solution you've been using you will have a good idea of how much to use if you even need to water. 4 days ain't bad unless they are already dry and in need of a watering

I would personally just wait until the new ph pen comes in, it happens, it's happened to me for sure.