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.

Secchi Disk Science Source

To determine water clarity, lower the disk into the water and record the depth at which the disk is no longer visible. The durable black and white plastic disk measures 20cm in diameter.

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