How to manage varying weights in a zero waste store?

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Hi. We are looking to run a zero waste store where customers fill containers themselves and items are sold by weight normally in grams. They do not have to buy in set amounts like 100g, 250g etc. could be for example 105g or 273g, depends how much they fill their containers. The customer can also buy barcoded products so they system would need to handle both.

From what I can see an app is required to support specific weights.

could anyone recommend a specific app?

thx