The lower brown plastic segment has a length of about 12 cm in diameter 17-18 mm.
There are 3 display "MIN.", "OPT." and "MAX.", which are well matched to the planter "Aqua Green".
I have the Geli water level indicator ordered for a planter other brand on the off chance and it fits.
Possibly are above-level information for owners of other planter helpful.
For cleaning you can disassemble the water level indicator, which my little daughter also discovered and was the reason why I was allowed to order now 5 new indicator.
The red plastic measuring indicator inside is in fact relatively thin and not particularly flexural strength, but because it is its function in the plastic tube well fulfilled and there relatively protected, greater robustness is actually not really necessary.
With regard to the life I can not write much, if there is no update in this review are all still in working order.
So far, at any rate a buy recommendation.