pH testers, are designed for different substances, so preferably you would want a soil tester for pH. duh? sorry.

Anyway i just baut a 500g thing of 20-20-20 fertilizer at Canadian tire (if u live in Canada, do they have canadian tires in USA?) for like 8 buck Can. that should last you the season, don't waste ur time trying to make something u r already unsure of, just take it easy. God im stoned