You know, for B&W developers I find that accuracy to the tenth of a gram is entirely superfluous. (Maybe it is with benzontriazole or phenidone, but we are not talking about these here.) I have had NO problem measuring in this way and I will also 'commit a sacrilege' by stating that I ROUTINELY measure even pre-packaged powders in this way as well. For example, a one liter package of Dekrol has 125 mL in volume, If I want to mix 200 mL of stock solution I simply use 25 mL of the powder.
Theoretically, that can lead to mismatches with the various components of the developer. But I will wager that if you hired a mathematician to do the numbers, the bell curve standard deviation for error would be maxed at about 3%, and most likely even less. For DECADES I have done this with no ulterior results.
Fears can be surprisingly effective with never daring to do things like this. Repetition does wonders to harness such nefarious activities. But, through many years of experience, I now have none of those fears. Whenever I mix a new batch of developer, I always do a simple clip test. I always find that I did not have to do that, but I still do, just to be certain.
I am a little bit on the weird side, but that weirdness does me, or others, no lasting harm. - David Lyga