I bought a scale when I started doing EI. Here <-----thats it! Hasn't failed me yet. Though I did have to buy new batteries for it today. If you get it, you can take it to a jewlers and see if they will calibrate it for you. I should probably take mine with me to my chem lab and see if they will calibrate it for me. I've been using mine just how it came out of the box since I got it. I haven't had any problems. Tanks look great!
Since it is really tiny, it helps to set a paper cup on it. Tare it, then measure the ferts into the cup.
As for 1gram= 1 ml I don't think thats right........ for some reason I want to say 1 gram= 1 cm cubed.......but I'm not certain
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