Soapmaker Man said:
My Weigh KD7000 - Black - Postal Scales / Food Scale / Candle and Soap Making Scale
That is a great balance (I own one as a matter of fact), but as I mentioned it depends somewhat on the size of the batch. Generally speaking, soapmaking measurements should be accurate to 1 part per thousand (+/- 1 ‰). Since the resolution of the KD7000 is 1g, it's suboptimal to use it for massing amounts less than 1000g (about 35 oz).
For amounts from 100g-1000g, you'd want a decigram balance (0.1g resolution) like the MyWeigh iBalance 2600. For amounts from 10g-100g a centigram balance like the MyWeigh iBalance 201 would be a good choice.
Keep in mind that the NaOH is the controlling factor, as it is the critical measurement of least magnitude. So when I give a range like "100g-1000g", consider that as your NaOH mass. Put another way, whatever range your NaOH mass falls into, that's the balance to use.
Here's a simplified guide* to batch size and balance selection:
1 or 2 experimental bars: centigram (0.01g) resolution
3 to 24 bars: decigram (0.1g) resolution
more than 24 bars: gram (1g) resolution
* Adapted from Kevin Dunn's most excellent book "Scientific Soapmaking".
Some may jump up and down at this point and say I'm splitting hairs, but proper measurement can take a LOT of the guesswork out of soaping. Ever wonder why a batch from the same recipe worked out differently than the last one? More often than not measurement techniques are the cause. If you make the effort to be consistent batch-to-batch, you'll spend less time figuring out what went wrong and will have more time for experimenting with the fun stuff!!