In message et, Dave
Liquorice writes
On Sun, 10 Aug 2008 16:58:16 +0100, dennis@home wrote:

Well they don't usually measure the level in the tanks, they count the
number of pulses and use maths to work out how much is left.
If no ink is coming out it will still count the pulses as it has no way
of knowing.

Exactly so you end up with a cartridge that says it is empty when in fact
there is plenty of ink in it. And with the stuff costing not far short of
£500 per litre you don't want to be chucking it away.

The black toner cartridge in my Epson laser printer has reported as
being low for 6 months now


--
geoff