I bought this pH tester a few years ago when I tried hydroponics. Only did one grow and didn't really use it. It comes with almost full bottles of pH up and down, and calibration solution. For more info on the tester, go here:
https://hannainst.com/hi98127-phep4-ph-tester.html?srsltid=AfmBOopKDiRr6s8vSV8eMymj6AJLERqLaR_fAiwhIVFpwu4FeHdkSXyA
It's worth $150 and is in excellent shape, only asking $90. Sorry, no trades.