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A2 cwk respirometer improvements OCR watch

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    Ok i'm doing the evaluation for the respirometer experiment. I got to get one more improvement. At the moment I have changing the potasium hydroxide every temprature and repeat done. Also have a control object in the test tube and to make the joints air-tight by putting vaselline on them. Can anyone help me with one more please????
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    Come on some suggestions??? Seriously i only need one more and would grately appreciate a suggestion. Thanks
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    extend timing, try different susbstrates? electric respirometer-- better than human eye reading?
 
 
 
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