The Drawing Said 11.5 by 11. The Sample Measured 11 by 9.

What spec drift looks like when it reaches the inspection table.

Most shipments we inspect do not fail on workmanship. They fail because the thing in the carton is not the thing in the drawing. Not badly different. Different by a centimetre. Different by a tenth of a volt.

Five real findings, translated from reports. No customer or factory named.

A charger that would not reach full charge

"The actual battery voltage is 4V. A fully charged battery should read 4.2V, which does not meet the customer's full-charge requirement."

Four volts against a 4.2 volt requirement. On a bench, that is a rounding error. In a product that promises a full charge, it is a warranty claim waiting for a date.

A part that missed its dimensions on both sides

"The actual product dimensions are 11 by 9 centimetres, not the 11.5 by 11 centimetres specified in the documents."

Half a centimetre on one axis and two centimetres on the other. Wall thickness, insert fit, and retail box cavities all reference that number. The spec sheet had it. Production did not hit it.

Balloons that changed size twice

"Bow balloons measure 78.3 by 64.4 cm before inflation and 65.7 by 53.3 cm after inflation, against the documents' 78 by 68 cm before and 77 by 63 cm after." "Matcha balloons measure 30.75 by 16.61 inches after inflation, against the documents' 30 by 18 inches."

Note the direction. After inflation the bow balloon came out smaller than spec on both axes, and smaller than it measured flat. Elastic material moves under pressure. If your listing quotes inflated dimensions, this is the number that reaches the customer.

A carton with the wrong order number

"The side mark order number does not match the documents."

One number on the carton, a different number in the paperwork. Any warehouse scanning that carton against the ASN finds a mismatch and the container waits.

Artwork that drifted from the approved sample

"The colour box artwork on the production units differs from the sample."

The gap between an approved sample and a print run is where most packaging disputes start. Someone reshot the plate, or a different print house ran the second batch, and nothing was flagged because nobody compared.

Carton dimensions set your freight bill

A carton that measures 11 by 9 instead of 11.5 by 11 is smaller, which sounds harmless until you remember carton dimensions are what your freight quote and your marketplace size tier are built on. Small drift in a carton multiplies across a container.

This is why measurement holds ranked second in our sample, with 42 of them across 164 inspections. Only shipping marks produced more.

The one document that prevents most of this

A tolerance range.

Give the inspector a nominal dimension and an acceptable range. Give them the voltage window. Give them the inflated size. Then the check produces a yes or a no, and you get it while the goods are still at the factory, where a correction costs a shift instead of a container.

Without a tolerance, the inspector reports what they measured and marks the section hold. You then decide, under time pressure, whether half a centimetre matters. That decision is cheaper to make in advance.