Superfish Digital Test pH Calibration Liquid

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If you've already invested in a Superfish pH pen then this pH Calibration Liquid is a must to ensure you're getting the right readings. Over time, pH pens will vere off their suppo sed readings and this is the time to use the Superfish pH Calibration Liquid - it ensures the absolute correct reading on your pen so you know you're getting right readings in your fish tank. Show more