If produce packs are consistently heavy, lowering the fill target may look like an easy saving. First check whether the apparent excess comes from an incorrect tare, unreliable weighing, drift during the run or a wide spread of individual pack weights.
Measure the process before changing the target. Keep packs below the declared quantity visible alongside heavier ones, and have the responsible weights-and-measures or quality specialist assess the applicable requirements. This audit is a process diagnostic, not a legal net-content test or compliance certificate.
Keep three quantities separate
Declared quantity is the quantity stated on the pack. Target fill is the operating setting or instruction used by the packer. Actual net quantity is the measured product quantity after accounting for packaging under the documented method.
Gross weight includes the product and its packaging. Tare accounts for the relevant packaging. A process record needs both the tare basis and the resulting net quantity. Do not label a gross scale reading as the amount of produce sold.
The 2026 edition of NIST Handbook 133 includes formal gravimetric procedures for packaged goods. Its weight-testing chapter addresses tare variation and defined test methods. Establish which rules and methods apply at the destination before using a process audit as evidence in a formal inspection.
Verify the measurement before investigating the packer
Identify the scale, its verification status, resolution and suitability for the task. Have authorized personnel perform the required checks using the appropriate procedure and reference equipment. Record the result and any limitation. A displayed decimal place is not proof of accuracy.
Confirm the packaging configuration used for the tare: container, lid, label and any other relevant components. Record packaging lot and format changes. Ask the responsible specialist how tare should be established for this product and purpose, including any applicable treatment of moisture or retained material.
Keep the documented tare method with the run. An assumed value copied from a different container can make the calculated net quantities look consistently wrong. If the basis cannot be verified, preserve the gross observations and mark net results provisional instead of blaming product filling.
Do not adjust, reseal or override controlled weighing equipment as part of this worksheet. Escalate a failed check through the authorized process before relying on its data.
Record a run in time order
Define the lot, product grade, pack format, station and observation window. Agree a sampling plan appropriate to the diagnostic question, and state whether the sample can represent the whole run. Convenience observations from a short quiet period are not automatically representative.
Download the time-ordered pack audit. Give each observed pack an ID. Record time, gross reading, applicable tare, calculated net quantity, declared quantity and operating target separately.
Include reworked and rejected packs with their status rather than retaining only accepted output. Link a second observation after rework to the original pack ID so the same pack is not counted as two finished units. Record format changes, interruptions and other events that may help explain the pattern.
| Record group | Fields to retain |
|---|---|
| Identity | Run, lot, pack ID, format, packaging lot and timestamp |
| Measurement | Scale ID and check, gross, tare, tare method, net and units |
| Comparison | Declared quantity, operating target and signed deviation |
| Process context | Station or role, interruption, handling stage and relevant changes |
| Disposition | Observed, reworked, rejected or accepted; linked repeat observation |
| Review | Measurement limitation, corrective action, owner and verification |
Use the role or station information to understand the process. A small sample is not a sound basis for judging an individual worker. Explain the audit’s purpose and follow workplace and privacy requirements.
A positive average can hide a low pack
Illustrative arithmetic only: three packs declared as 500 g have verified net quantities of 496 g, 504 g and 510 g. Their signed deviations are −4 g, +4 g and +10 g. The average deviation is about +3.33 g, yet one pack is below the declared quantity.
The positive excess totals 14 g; the deficit totals 4 g. The signed total is therefore +10 g. These answer different questions. Do not report only the positive average and discard the low observation. This three-pack illustration is not a prescribed sampling plan or a legal pass/fail example.
NIST’s general requirements distinguish average and individual-package considerations. Whether a particular low pack or lot fails an applicable rule requires the relevant jurisdiction, test procedure and limits. The audit should flag the observation for that review.
Use the distribution and excess-mass summary sheet to retain the mean signed deviation, individual low packs, positive excess, deficits and observed range. Preserve time order in the original log even when producing a summary.
Which pattern should be investigated?
A consistent offset: check the scale and tare evidence before concluding that every pack contains too much product. A fixed-looking difference is a clue, not proof of its cause.
A change partway through the run: compare the timing with a packaging change, adjustment, interruption or verification result. Keep earlier and later observations separate while investigating drift.
A wide spread: investigate why some packs are low while others are high. Reducing a common target without controlling variation can leave the low side unresolved. Discuss the appropriate corrective action with the packing and quality team.
After an authorized correction, repeat the observation under comparable conditions. Assess both the distribution and the applicable net-content review, not just whether the average became lighter.
Value only the excess the evidence supports
For the observed packs, sum positive deviations separately from deficits. If a representative sampling basis supports a run estimate, state the sample coverage, finished-pack population and estimation method. Otherwise report sampled excess only.
Any valuation needs the farm’s justified marginal value for that quantity and a realistic account of what could be recovered. Extra grams are not automatically additional retail sales. Some overfill may be intentional to control the process, and changing it requires an approved target and evidence that low packs remain controlled.
A useful improvement claim combines verified weighing, a stable pack-weight distribution and documented compliance review. It does not begin and end with a lower fill setting.
