Digital pH Meter and TDS Meter combo via eBay for $11.95 with free shipping
Use the pH meter to check the pH of your water, mash, [test Star San effectiveness] and finished beer. The TDS meter could come in handy for checking your RO filter [See: Review – Portable Reverse Osmosis Water System] or for checking purchased distilled or RO water. Some water processors add minerals back for flavor. A TDS meter will allow you to make sure you’re getting what you want.
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