Three Ways to Order Your Science Supplies

Online - Pay by credit card, check or your account.

By Phone - Call us at 800.628.7748
Mon.- Thurs. 7:30 -3:00 pm EST, Fri. - Closed


By Fax - Fax your order with our
pdf form.

Hydrion Water Hardness 


Two different 15 foot rolls of paper in one container. One paper gives readings at 0-5-10-20 grains per gallon of hardness as calcium carbonate. The other paper is for definitely hard water and covers 10 to 50 grains per gallon of hardness.

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