Battery Operated Scale Sample Leads

I am a small farm owner looking to sell at local farmers markets this summer. I need a small scale that will weigh produce from 2-4oz to 10lbs and that can be certified for use by the Dept of Agriculture in --. Due to the fact that I will be working on the street, power is not always available, so battery operation would be best. I would be interested in the price difference between a simple scale vs a scale capable of computing the price by weight. Thank you for your help.

Looking for a robust scale that can be used in the field (Battery or 12 v from car operated) for weighing pasture and crop samples. These will be freshly cut, sometimes damp, ocasionally containing a small amount of soil. Sample size will usually be 1 square metre size and sample could weigh from 100 gram to 10 kg. If scale range is higher, even better. Ideally would like to weigh in 1 gram increments as quad size is then multiplied by 10,000 so accuracy important.

REMOTE READOUT FOR AUDIANCE PORTABLE 0-40LBS. USED FOR FISHING TOURNAMENTS