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The pH devices that you can buy aren't that reliable either (the ones where you stick them in the soil and it has some sort of display that shows you what the pH is) pH meters need to be calibrated in order to measure accurately and the devices you can buy cheaply can't be calibrated. The chemical tests are more accurate than the devices, but if you don't trust those either then really your best bet is to send it out to a soil test lab and have them do it (your local extension office could probably recommend one)