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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
These Calcium Hardness Test Strips 486629 are used in the Sensafe Exact Micro 7 Photometer and in other water testing micro meters.
Spa and Swimming pool owners should test pool water for calcium regularly to ensure their hardness is in the proper range. Low calcium levels can result in corrosive water, which stains pool surfaces and destroys tile grouting and metal or plastic equipment. Likewise, if your pool water calcium level is too high and your water is too hard, scale can form on pool surfaces and in your pipes. High calcium hardness in pools can also lead to sore eyes.
A full refill kit for the Exact Micro 7 meter would include these eXact Strip Micro test strips (each sold separately):
*The DPD-3 Total Chlorine strips that came with the eXact Micro kit require the use of a DPD-1 strip to test for free chlorine, whereas the DPD-4 strips do not.