{"product_id":"secchi-disk","title":"Secchi Disk","description":"\u003ch3\u003e\u003cspan style=\"color: rgb(255, 128, 0);\"\u003e\u003cem\u003eTurn how clear a lake looks into a number you can track\u003c\/em\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Secchi Disk is an 8.75\" white plastic disk marked with black and white quadrants, attached to a weighted, foot-marked line. Lower it into a lake, pond, stream, or aquarium until the pattern disappears from view, then read the depth off the line. That depth, the Secchi depth, is a standard field measurement of water clarity used by limnologists and water quality monitoring programs.\u003c\/p\u003e\n\u003cp\u003eThe disk's pattern is permanently screen-printed, so it won't scratch or fade off after repeated dunkings. The line is rot-proof polymer wound on a foam bobbin, marked at every foot, and an attached sinker keeps the disk dropping straight down instead of drifting in current. No meter, batteries, or calibration involved, just a disk, a line, and a clear reading each time.\u003c\/p\u003e\n\u003cp\u003eWorks for pond, lake, and stream water quality studies, environmental science and limnology units, and citizen science water monitoring programs, from middle school through college.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy Teachers Love It\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eOne Reading, One Number\u003c\/strong\u003e – The disappearance depth requires no equipment or calibration, just a value students can log and compare across sites or visits.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eTrack Water Clarity Over Time\u003c\/strong\u003e – Students can survey the same pond or stream across a semester, turning Secchi depth into a real, ongoing dataset instead of a one-time measurement.\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003eField-Ready Durability\u003c\/strong\u003e – Permanent screen-printed pattern and rot-proof line hold up to repeated trips into the water.\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Arbor Scientific","offers":[{"title":"Default Title","offer_id":55821284016201,"sku":"20-3010","price":35.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0030\/6207\/1369\/files\/20-3010SecchiDisk2048x2048.jpg?v=1784747475","url":"https:\/\/www.arborsci.com\/products\/secchi-disk","provider":"Arbor Scientific","version":"1.0","type":"link"}