No livelihood issue is too trivial. Make sure you don't miss it ! Tips on Weights and Measures when shopping in markets:

Is the weighing tray empty before weighing?
Is the weight precise?
Is the price clearly displayed?
Is the scale reading clear?

How to avoid short-weight malpractice?
• Check whether the weighing equipment's reading is set at "0" before weighing
• Prior to weighing, make sure the weighing tray is empty
• Pay attention to the act and process of weighing by the traders
• Traders should move weighing scale reading side towards consumer
• Make sure you have received all the weighed items before leaving
• Request and keep the transaction receipts for easy follow-ups
• Use public scales to check the weight of goods purchased
• Ask the traders to clarify immediately in case of any enquiries
• Call Customs hotline to lodge complaint if encountering suspected shortweight activities