i previously owned the regular tester and always got zero which i never believed. i certainly had algae which apparently IS possible with real zero readings lol. i now use the ULR and for a while i couldn't get back-to-back consistent readings.
now i do a few things that seemed to have made testing reliable and i now like the device:
- only use one of the glass containers. zero the unit and add reagent to same one. avoid differences in glass/scratches etc between containers.
- store ro/di in container between uses then rinse well before use
- made a decent paper funnel to ensure i can more accurately get all or almost all the reagent into the container
- always rotate the glass to the same orientation in the device
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