{"product_id":"turbidity-tube-60-5cm","title":"Turbidity Tube 60.5cm","description":"\u003ch2\u003eMeasures water clarity in a stream, where a Secchi disk cannot go\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003e60.5cm assembled, in two parts. 25mm clear polycarbonate tube marked 10 to 400 NTU. $48.00.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA Secchi disk needs still, deep water - a lake or a dam. A turbidity tube does the same job in a creek, a drain, a puddle or a bucket, because the sample comes to the tube rather than the tube going to the water.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow it works.\u003c\/strong\u003e Pour the sample in and look down the tube at the pattern printed on the base. When the pattern disappears, read the water level against the NTU scale. The cloudier the water, the less you can pour before it vanishes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRange 10 to 400 NTU\u003c\/strong\u003e, which covers everything from a clear creek after dry weather to a stormwater drain after rain. That range is where school waterway monitoring lives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTwo parts.\u003c\/strong\u003e It packs down to about half its length, which matters when it travels in a backpack to a field site. Clear polycarbonate rather than glass, for the same reason.\u003c\/p\u003e\u003cp\u003eThe single most useful thing a class can do with it is measure the same site repeatedly over a term - turbidity moves with rainfall, and the pattern is the lesson.\u003c\/p\u003e","brand":"Educational Vantage","offers":[{"title":"Default Title","offer_id":53793078509931,"sku":"EVSER1103018","price":48.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/2795\/8891\/files\/ser1103018_turbidity-tube-60-5cm.webp?v=1788358601","url":"https:\/\/megaofficesupplies.com.au\/products\/turbidity-tube-60-5cm","provider":"Mega Office Supplies","version":"1.0","type":"link"}