Spec inflation is a description problem, not a number problem
Spec inflation is the habit of describing a parameter in a way that sounds more precise than the evidence supports. A quotation may name a motor, a silicone grade, a battery capacity and a noise figure, and every line may be technically plausible, while the figures are measured under different conditions or taken from a different sample. The buyer is left comparing descriptions rather than measurements. The counter is to require a test condition for every figure and a sample for every claim.
This checklist describes how to read a specification sheet and ask for the condition behind each figure. It does not claim that any particular figure is inflated. It approaches the specification as a set of statements that must each carry a method.
Spec inflation checklist table
| Claimed line | What makes it sound specific | What to ask for |
|---|---|---|
| Motor power | A number with a unit | Motor type, gear ratio, driver, and the test condition |
| Silicone grade | A shore number | Grade family, shore range, and whether it is on the skin-contact part |
| Battery capacity | A capacity figure | Whether the figure is per cell, per pack, or at a stated cutoff |
| Runtime | A hours figure | Level setting, heating or driver switch state, and measurement method |
| Noise | A decibel figure | Distance, A-weighting, and the mode or speed setting |
| Shell material | A material name | Whether the figure is the shell only or the shell plus the closure |
| Fit | A "comfortable" description | Geometry, band length range, and contact area |
| Controller | A button count | Whether the count is on the sample or on the drawing |
| Certification | A standard name | Whether the document is included and for which market |
| Weight | A mass figure | Whether it includes the closure, the pad and the cable |
Condition, sample and revision
Every figure should carry a condition: the level setting, the switch state, the measurement distance, the ambient condition and the sample state. A runtime figure without a level setting is not comparable to another runtime figure, because the motor and driver draw changes with the setting. A noise figure without a distance is not comparable, because sound falls off with distance.
Every figure should also carry a sample identity: whether the figure came from a golden sample, a pilot run or a laboratory report, and whether the figure applies to every production batch. A figure from a golden sample is a statement about that sample, and the buyer should ask what happens when the production units differ. See neck-massager-intensity-levels-runtime for how level settings affect runtime, and neck-massager-noise-shell-controller-checklist for the noise measurement.
A boundary to keep in view: a number is not a measurement
A number on a specification sheet ≠ a measurement, and a measurement ≠ a guarantee. A figure without a condition is a number, and two numbers measured under different conditions cannot be compared. The buyer should ask for the condition and the sample identity before reading the figure as a comparison basis.
The second boundary is that a higher figure is not automatically a better unit. A higher motor figure can come with a different driver and a different shell, and a longer runtime figure can come from a larger battery and a heavier unit. Compare the figure with the condition and with the unit it describes.
Questions to ask a supplier
- For each figure, which test condition was used, and at which level or mode setting?
- Was the figure measured on a golden sample, a pilot run, or a laboratory report?
- Which document records the figure, and who signs it?
- What changes would trigger a re-test, and what happens if the production sample differs?
- Is the figure quoted for every production batch, or only for the sample?
Reading the sheet line by line
The practical method is to build a second sheet with three columns: the claimed line, the condition, and the sample identity. Fill in the condition for every line, and mark every line where the factory cannot state a condition. A line without a condition is an open item, and open items should not be read as filled in.
A second method is to ask for the report behind the figure. A laboratory report, a sample record or a pilot-run record gives the method, the condition and the sample identity in one document. Ask whether the report is included in the quotation or quoted separately, and whether the report names the model being bought. When two suppliers quote the same figure, ask whether both figures came from the same method, the same sample state and the same measurement distance before the figures are placed side by side.
Frequently asked questions
Can two suppliers quote different figures and both be right? Yes, when the conditions differ. A runtime figure at a low setting and a runtime figure at a high setting describe different conditions, and neither is wrong.
What if the factory cannot state a condition? Read the line as an open item, and ask for a sample measurement at a stated condition before the figure is used in a comparison.
Next step
Send the spec inflation checklist to the factory, ask for a test condition against every claimed line, and request a tailored quotation through contact. For the runtime and level settings, see neck-massager-intensity-levels-runtime. For the BOM behind the claimed lines, see neck-massager-bom-breakdown.
From the Serenivo comfort-product notes. Descriptive material only; no health or medical outcome is stated or implied.