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The choice of the second buffer depends on your application: if you measure values below pH 7, use pH 4 as a second buffer. If you measure values above pH 7, use pH 10 as your second buffer. Some of our pH meter use 3 points calibration, keep in mind to always start with pH 7 first and others after.
This means that just one meter is needed to record all of that unitâs water use. However, in buildings with a common water heater (boiler), each unit is served by two water lines: one for cold water and one for hot water. Thus, two meters are needed to record all the water use in that unit.This makes metering much more expensive, since not only are two meters needed, but also a meter approved for up to 250Â° F is needed for the hot-water line.Such meters cost approximately $100 more than cold-water meters.hus, two meters are needed to record all the water use in that unit. This makes metering much more expensive, since not only are two meters needed, but also a meter approved for up to 250Â° F is needed for the hot-water line. Such meters cost approximately $100 more than cold-water meters.