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prow · 11-28-2006, 01:34 PM

woodstock, i have that same refract, the RHS-10ATC. mine tests perfect as well. its made in china, a cheap one. but i have been using it for a while now by just using RO/DI water to calibrate. after all the talk about refracts being off i needed to konw for sure if mine was accurate.

so i tested it with various concentrations. i used a 10% saline solution, its used to induce sputum in ventilated patients. easy to mix small batches up, they come in 15ml sizes. you can get them at any medical supply store. pretty cheap too. mixed it with sterile water. first test was 3.5ml of the 10% solution and 6.5ml of sterile water. it tested right on 35ppt. repeated this at various concentrations 10 tests in all, including hyposalinity, and all were right on. RO/DI was right at 0. mixing the 10% solution with RO/DI water had the same results in the two tests i did with it.

11-28-2006, 01:34 PM	#20 (permalink)
prow Manta Ray Join Date: May 2005 Location: Redondo Beach, CA Posts: 3,936 View Gallery Karma Komment Add yours!	Re: Refractometer; New ref.std. woodstock, i have that same refract, the RHS-10ATC. mine tests perfect as well. its made in china, a cheap one. but i have been using it for a while now by just using RO/DI water to calibrate. after all the talk about refracts being off i needed to konw for sure if mine was accurate. so i tested it with various concentrations. i used a 10% saline solution, its used to induce sputum in ventilated patients. easy to mix small batches up, they come in 15ml sizes. you can get them at any medical supply store. pretty cheap too. mixed it with sterile water. first test was 3.5ml of the 10% solution and 6.5ml of sterile water. it tested right on 35ppt. repeated this at various concentrations 10 tests in all, including hyposalinity, and all were right on. RO/DI was right at 0. mixing the 10% solution with RO/DI water had the same results in the two tests i did with it.