Shisha buyer guide · Article 213
How to Check Net Weight Consistency in Shisha Charcoal Retail Packs
Separate product mass from packaging, select identified packs and retain individual readings. Confirm the weighing method and destination requirements before making a release decision.
01 · Define the quantity being checked
Compare product mass with the declared net contents.
A shisha charcoal pack net weight check should measure the product quantity separately from its packaging and connect each result to an identified pack. Begin with the declared net mass on the retail label, the product and pack revision, production lot, inspection purpose and agreed method. A sealed pack’s total weight is not its net charcoal weight.
Distinguish gross mass, tare and net mass. Gross mass includes the contents and packaging. Tare is the packaging mass accounted for under the selected method. Net mass is the product mass after that packaging allowance is removed. Use consistent units and preserve the original readings.
Decide whether the exercise is an internal consistency review, a buyer inspection against agreed specifications or formal net-quantity compliance testing. Those purposes may require different procedures. This worksheet is a buyer record, not an ISO, AQL or accredited method, and it sets no legally permitted shortage.
02 · Confirm the scale is suitable
Display resolution alone does not establish measurement quality.
Record scale identification, capacity, displayed division or resolution, and its relevant calibration or verification record. Confirm suitability for the load and the decision being made with the responsible inspection provider. A scale that can support a pack may still be too coarse to resolve differences relevant to the review.
Use the agreed weighing setup: a stable surface, appropriate operating conditions, a clear platform and a correctly checked zero. Follow the instrument instructions and the applicable inspection procedure for checks before and during use. Record any check result or adjustment rather than assuming the display guarantees accuracy.
Where repeated readings are part of the method check, retain them under the same pack or check-object reference. If readings are unstable or disagree enough to affect the intended decision, resolve the setup or instrument concern before interpreting small pack differences.
This guide provides no universal scale-division rule. A compliance procedure may specify equipment criteria and measurement-uncertainty requirements. Have the responsible provider confirm those criteria for the actual product, quantity declaration and destination.
03 · Select packs before looking at their weights
Preserve lot and carton coverage.
Define the inspection population using lot IDs, carton counts and pack configuration. Create a list or other usable selection frame and agree how packs will be selected across the cartons and lots under review. Use a recorded random selection process where required by the plan; choosing the most accessible or fullest-looking packs is a different basis.
Record selected carton and pack IDs before weighing. If a selected pack is absent, damaged or inaccessible, retain that fact and follow a pre-agreed replacement rule. Keep deliberately selected damaged packs separately identified as investigation samples instead of silently mixing them into the planned random selection.
Agree the number of packs, distribution across lots and any expansion or stopping rule before collection. Do not treat a convenient count as a certified sample size. Report the actual packs examined and the scope they cover; one favorable carton cannot establish the contents of every other carton.
Use the carton-and-lot guide for source mapping and preserve sample identity through any transfer to an inspector. Keep different label declarations or packaging revisions identifiable so their weights are compared against the correct reference.
04 · Establish and document tare
Packaging variation can change the calculated net result.
Choose the weighing and tare approach before starting. One approach is to measure product directly into a suitably tared receiving container, recording the container reference and product-recovery method. Another is to determine net mass from the filled pack’s gross mass minus its documented packaging tare. Confirm the procedure with the responsible inspector.
For a gross-minus-tare approach, identify all packaging components included in the gross reading and how their tare will be determined. A pouch, label, inner wrap or insert should not be omitted merely because it is small. Retain the link between the pack and its tare record.
An individual used-pack tare and a tare estimated from a separate packaging sample are different evidence bases. If an average tare is permitted under the chosen procedure, record the packaging sample, selection, observations and justification. Do not assume one empty pouch represents every packaging configuration.
Account for product left in packaging or lost during opening according to the agreed method. Photograph relevant damage or handling exceptions and retain the observations. Do not clean, dry or otherwise alter packaging without following the selected procedure, because that can change the tare basis.
Illustrative arithmetic only: a hypothetical gross reading of 1,040 g minus a documented tare of 40 g gives 1,000 g net. This is a calculation example, not a Unimax pack specification, current inspection result or statement of legal compliance.
05 · Record individual results and variation
An average can hide the packs that need review.
For every selected pack, retain the label declaration, gross and tare readings where applicable, calculated or directly measured net mass, method, scale ID, lot, carton and exceptions. Record the inspection date and operator. Keep the raw observations even if a calculation is later corrected.
Calculate the signed difference as observed net mass minus declared net mass. A negative difference indicates the measured result is below the declaration; a positive difference indicates it is above. That comparison alone is not a legal pass or fail, which depends on the applicable procedure and decision rules.
Review individual results alongside summary statistics and source groups. A pooled average can conceal a lower result or a difference between lots. Report what was examined and distinguish observed sample variation from claims about unexamined stock.
If a result is close to a decision boundary, apply the agreed rule for rounding and measurement uncertainty. Do not add an improvised allowance. Where the evidence cannot support a decision, mark it for review and identify the missing information.
06 · Confirm destination requirements before release
Keep the buyer worksheet separate from a compliance determination.
Ask the importer or responsible local adviser to identify the current net-quantity requirements for the destination and the actual retail declaration. Record the jurisdiction, applicable source or procedure, version or effective date, required sampling and decision rules, and the responsible reviewer. Do not transfer a tolerance from another country or product category.
Clarify whether the commercial specification adds a requirement beyond the applicable legal framework. Record contractual criteria and the compliance procedure separately so a buyer’s preferred acceptance condition is not presented as the law.
Close the record with a documented disposition: accept under named agreed criteria, hold for clarification, investigate a defined discrepancy or repeat collection under a revised plan. Retain the original results and explain any additional weighing. Repeating only unfavorable readings until they look acceptable is not a defensible review.
Request the current product and packaging specifications and agree the inspection scope before making a shipment decision. This page makes no claim about current Unimax pack weights, batch pass rates or destination-specific legal tolerances.
Buyer tool · retain readings and method references
Net weight inspection record
Inspection ID ___; company / destination ___; product and pack revision ___; inspector ___; date ___. Complete the scope once, then repeat the pack-reading fields for every selected pack. This record supplies no legal tolerance or certified sample plan.
| Inspection area | Required definition / reading | Evidence to retain | Control / next action |
|---|---|---|---|
| Scope / declaration | Product ___; pack revision ___; declared net mass / units ___ | Lot IDs ___; inspection purpose ___; criteria reference ___ | Reviewer ___; scope agreed ___ |
| Scale / setup | Scale ID ___; capacity ___; division / resolution ___ | Calibration or verification reference ___; setup / zero checks ___ | Suitability confirmed by ___; unresolved issue ___ |
| Selection | Population / carton map ___; random selection method ___ | Selected carton / pack IDs ___; planned / actual count ___ | Access gaps / replacements ___ |
| Tare method | Direct product weighing or gross-minus-tare ___ | Components ___; individual or estimated tare basis ___ | Procedure reference ___; assumptions / limits ___ |
| Pack readings | Pack ID ___; declaration ___; gross ___; tare ___; units ___ | Net result ___; signed difference ___; date / operator ___ | Retain original readings and calculation corrections. |
| Handling exceptions | Damaged pack ___; product retained / lost ___ | Opening / transfer method ___; photos / observations ___ | Review effect on result ___ |
| Summary / variation | Individual results ___; lot / carton groups ___ | Summary ___; method limits ___; borderline results ___ | Do not substitute an average for the decision rules. |
| Destination review | Jurisdiction ___; current applicable source / version ___ | Sampling / equipment / decision rules ___; adviser ___ | Contractual criteria separately recorded ___ |
| Disposition | Accept / hold / investigate ___; supporting criteria ___ | Open conditions ___; additional check rationale ___ | Approver ___; action / owner / review date ___ |
Calculation record: gross mass − documented tare = net mass, when using that method. Observed net mass − declared net mass = signed difference. Use one unit throughout and retain the original readings.
Decision record: applicable procedure ___; criteria and uncertainty treatment ___; result ___; open conditions ___; reviewer / date ___. A calculation by itself is not a compliance determination.
Retail-pack net-weight questions
Can I compare the sealed pack weight directly with its net label?
No. The sealed pack’s gross mass includes packaging. Determine product mass using the agreed direct-weighing or documented tare method.
Can one empty pouch supply the tare for every pack?
Do not assume so. Packaging components and variation matter. Use the tare determination required by the selected procedure and retain its evidence.
Does an acceptable average prove every pack is acceptable?
No. Keep individual results and apply the actual decision rules. A summary alone does not establish the condition of every pack or lot.
What shortage is legally permitted?
This guide sets no legal shortage allowance. Confirm the current requirements and applicable testing procedure for the destination and actual declaration with the responsible reviewer.
Procedure reference
Use the applicable procedure for the actual market.
NIST Handbook 133 is a procedural guide for compliance testing of packaged-goods net-content statements, developed primarily for government officials. It is a useful technical reference, but citing it here does not establish which requirements apply to your destination or make this buyer worksheet a compliance inspection.
Commercial discussion
Request a pack specification tied to your inspection scope.
Share your destination, product and pack requirements, declared net mass requested and inspection objective. Request current specifications, identified samples or an agreed inspection scope. Confirm the packaging configuration and inspection arrangements for the inquiry.
Discuss an inspection scopeFactory and quality evidence · Shisha charcoal products · Contact Unimax
Related buyer guides
Evaluate a shisha charcoal sample · Prepare a pre-shipment inspection · Sample across cartons and lots · Plan the retail pack quantity