What a phone number actually is
A phone app can show a figure. That figure comes from whatever microphone, case, orientation and software the handset has that day. Two people can stand in the same bay and get different numbers because they used different phones. That is enough for a private “this feels loud” check. It is a weak basis for a staff complaint file or a contractor conversation.
A dedicated handheld does not magically become a legal instrument. It does give you one device, one set of buttons, and one product name to write beside the reading. On this site that named device is CENTER-32 Digital Sound Level Meter, English Version.
What this shop’s listing actually states
The live product is CENTER-32 Digital Sound Level Meter, English Version, listed at £165.99. The listed title states IEC 61672-1 Class 2. That is title text, not a published calibration certificate. Delivery on the page is 2–4 business days after dispatch on eligible UK orders, not next-day.
Why an app reading is a weak shared diary
For machinery checks, people usually want the same position, the same machine state, and the same instrument. A phone in a pocket, in a case, or with a cracked screen is a moving part. If you later ask what you measured last Tuesday, an unnamed app on an unnamed phone is hard to reconstruct. Related context is in the machinery checks guide.
None of that means this meter publishes an accuracy table versus phones. It does not. This article will not invent one.
A side-by-side without fake accuracy numbers
| Question | Free phone app | This shop’s CENTER-32 |
|---|---|---|
| What you can name in a diary | Usually the phone model and an app name, if anyone wrote them down | CENTER-32 Digital Sound Level Meter, English Version |
| Shared team device | Depends on whose phone is charged | One handheld if you keep it on the bench |
| Class 2 in a product title | Not a product listing on this site | IEC 61672-1 Class 2 appears in the listed title only |
| Integrating average, calibrator, UKAS, legal proof | Not established here | Not published for this meter either |
| Published price on this site | Free software, unknown phone cost | £165.99 on the product page |
Use the table as a procurement conversation, not as a claim that the handheld passes a standard the page does not document.
When the handheld is the next step
Buy the handheld if you want a named instrument for repeatable preliminary spot readings and you accept the published limits. Skip it if you only need a private impression, or if you actually need an assessor with integrating equipment. When the named meter is the right next buy, open the CENTER-32 product page.
Is a free app wrong?
No. It is a rough personal check. It is a poor shared record.
Does £165.99 buy a noise survey?
No. It buys the listed handheld, not a competent-person report.
Should I compare app numbers to the meter as a calibration?
No. This listing does not publish a comparison method or a tolerance against phones.