hi Nigel,

I have 1500 litre tank. On 'proper Estonian winter' (with temperatures
below -20 celsius), stove consumes about 1cm per day (which is about 10
litres). So - 1mm of oil level in tank corresponds to 1 litre.

What is the maximum precision you can squeeze out from ultrasonic ping
measurement? Should be well under 1mm?!

Aadu

> It would be easy to store total litres every hour, and 
> display a running total of 'litres per day' updated hourly if 
> that's what you want.
> 
> Nigel

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