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In glazes, engobes, underglazes, etc it is common to need tiny percentages of materials (e.g. pigments, anti-microbials, gums, gelling agents, flocculant, speaking agents). A scale like this enables accurately weighing to within one one-hundredth of a gram! These were prohibitively expensive in the past, but not any more. Newer 0.01g scales have a higher capacity also - this one can weigh 600g (older ones were only 100g). This higher capacity enables more flexibility in choosing a tray (shown are the ones you can buy). You can also 3D print light-weight trays.
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Weighing things is an essential part of DIY ceramics. Examples are the batching of glaze recipes, porcelain and stoneware clay bodies, engobes, underglazes, slips, casting slips. Weighing out the kaolin, ball clay, feldspar, silica, frit, etc requires a scale. Other examples include mixing slurries or plaster batches that require a specific water:powder ratio. For 3D printing a common need is weighing the amount of water a mold will hold as a way to measure its cc volume. Scales like this offer 0.1g accuracy and can handle 6000g (older ones could only handle 2000g). This enables counterbalancing stainless or even glass containers. These scales were very expensive in the past, but not anymore.
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