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Adjust the chemical dilution by scrolling or entering values.
For example, for Rodinal 1+25 in 300ml set one part developer to 25 parts water.
Changing the "volume" adjusts the required volume of both water and chemicals.
Displays the required volumes of developer and water for the desired dilution.
Set the desired time for developing.
The timer counts down from the set time to 0 and continues beyond that into additional time.