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My recommendation is for the hobbyist to set up a monitoring station whereby 3 cups, test tubes (I use shot glasses) are set up. Cal fluid in the first two and tank sample in the last. Store the probe in any of the 2 clean calibration fluids and take a new sample as often as you wish to determine the Calcium level.
If this unit is accurate then this sounds reasonable enough. If the probe will last a while using this method then it may be worth while.
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