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3 comments of this product found across Reddit:
BufoHostilis /r/dmtguide
1 point
1970-01-20 10:26:23.515 +0000 UTC

Hanna Instruments HI98103 Checker pH Tester

The electrode is removable/replaceable. Long and thin electrode. Lithmus paper works for measuring low ph, but not high ph because of the color of the bark. Though lithmus paper works for both acid and base stages of a mini-ab.

dethswatch /r/SeaMonkeys
1 point
1970-01-20 05:45:02.68 +0000 UTC

I bought one of these and you can calibrate it (by buying 4ph and 7ph solutions).

Works well.