Maxi Doser not holding calibration?

arking_mark

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So I'm having issues with my Maxi dosers. They are not holding their calibration at all. I calibrate the doser then immediately test it and get a different #s. I've calibrated by volume and weight. Please advise.
 
Just to be clear, I calibrated it 3 times in a row by weight:
1. 451.1g
2. 459.4g
3. 445.5g

So a ~1% ish difference. Is that about right for accuracy?
 
@Member No 1 - is spot on, sounds like the tubing needs to be replaced. Any idea how many cycles you have done on it?
 

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