On May 3, 7:42*am, "james" wrote:
I have a dehumidifier with pump that drains via a small plastic tubing
(about 5mm OD).
I'd like to monitor its performance by measuring how much water flows
through the tubing.
This should be cumulative. E.g. after one day the meter may indicate 1
gallon, after 2 days it may say 2 gallons, etc.

Is there a meter to do this? What is it called (so I can search for it)?

They are called flow meters. I would suspect that one to accurate
measure such a slow flow would be challenging. Even regular one stend
to be pricey. It would not surprise me to find out that an accurate
measurement system would cost more than the dehumidifier. Get a 5
gallon bucket. Use a scale or mark the bucket inside. Do that for a
few weeks and keep a log.