I have been using the Pinpoint PH monitor for 15 years from marine to freshwater aquariums. Styli are always easy to calibrate and last a long time. However, this company's probes are temperamental and the bulb at the end always seems to be broken. Now that I own two of these 18 months later I find them to be of poor quality. And the packaging is bad, suggests that they are used. I'd rather spend my extra money and get my probes direct from American Marine.
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