16mm Screw Top COD Test Tube
https://www.hplcvials.com/products/test-tube/16mm.html

16mm Screw Top COD Test Tube

To use the digital heater for the COD test, set the temperature on the digital display to 150°C. On no account must the heater be set at a higher temperature than that specified as this may cause a hazard through pressure build-up in the COD tubes.

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