WebEntry-level pH meters for $5 to $50 are usually pen-style meters with sealed electrodes. These meters are typically limited to reading only pH and are usually calibrated automatically. Most soil pH meters fall in this range. Midrange pH meters, $50 to $100, will be pen-style and handheld models suited to hobbies like beer brewing and wine making. WebUniversal indicator has many different colour changes, from red for strongly acidic solutions to dark purple for strongly alkaline solutions. In the middle, neutral pH 7 is indicated by …
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