A decibel reading is only worth as much as the standard behind it. Some of these listings publish a range, an accuracy figure and an IEC class; others publish a screen size. This hub sorts ten current sound level meters by what each manufacturer actually states, and explains which claims matter when the number has to convince somebody else.
Measure the Noise
Name the Standard
Make the Case
As an Amazon Associate, Akermin earns from qualifying purchases. Product links on this page are affiliate links.
Meters were sorted by the measuring range each manufacturer listing publishes, the stated accuracy, any named standard such as IEC 61672 or a NIST traceable certificate, the weighting options and whether readings can be stored or exported. We did not run laboratory tests and publish no measurements of our own. Where a listing gives no figure the entry reads Not stated.
The only listing here that names an IEC standard and ships a calibration certificate.
Records tens of thousands of readings and exports them to a spreadsheet.
A published range, a published accuracy and a published frequency response at the low end of the market.
No pick matches that combination yet. Try a wider budget or a different measurement.
| Product | Type | Stated range | Stated accuracy or standard | Logging or output | |
|---|---|---|---|---|---|
| CRYSOUND CRY2831 | Class 2 sound level meter | Not stated | IEC 61672-1:2013 Class 2, calibration certificate | Not stated | View |
| Extech 407730-NIST | Sound level meter with certificate | 40 to 130 dB | 2 dB accuracy, 0.1 dB resolution, NIST traceable | Not stated | View |
| Extech 407732-KIT with calibrator | Sound level meter kit | 35 to 130 dB | Calibrator supplied in the kit | Up to 16000 readings, USB | View |
| Extech 407732 | Type 2 sound level meter | 35 to 130 dB | Type 2 stated in the product name | Not stated | View |
| Extech 407730 | Sound level meter | 40 to 130 dB | A and C weighting stated | Not stated | View |
| Extech 407780A | Integrating sound level meter | Not stated | Integrating function stated in the product name | USB interface stated | View |
| DANOPLUS decibel meter data logger | Logging sound level meter | Not stated | Not stated | Up to 43000 records, Excel export | View |
| Goldeep SL750A | Handheld decibel meter | 30 to 130 dB | Plus or minus 1.5 dB, 31.5 Hz to 8 kHz | Not stated | View |
| Tadeto digital sound level meter | Handheld decibel meter | 30 to 130 dB | Plus or minus 2.0 dB | Max and data hold stated | View |
| TopTes TS-501B | Handheld decibel meter | Not stated | Not stated | 2.25 inch backlit LCD, no export stated | View |
Every figure here is taken from the manufacturer listing for that product at the time of research. Two Extech listings in this group carry bullet text that describes a different instrument entirely, so only the figures in their product names are quoted. Nothing on this page is a measurement of ours.
Four questions settle the purchase:
IEC 61672 Class 1 or Class 2, or an equivalent Type 1 or Type 2 description. One listing here names the standard and its year. That is the difference between a measurement and a number.
A meter drifts and a microphone ages. The Extech 407732-KIT includes an acoustic calibrator and the CRYSOUND states a certificate. Without one, you cannot show the instrument was right on the day.
A weighting follows human hearing, C weighting follows low frequency energy. The Goldeep states a response to 8 kHz, which is fine for neighbours and poor for machinery squeal.
Complaints are about patterns. The DANOPLUS states 43000 records with export and the Extech kit states 16000 readings over USB. Everything else shows a number and forgets it.
One product supplied with this topic is an electronic stethoscope for locating engine noises. It is a listening tool, not a measuring instrument: it has no decibel scale, no weighting and no published range, so it cannot appear in a comparison built on stated measurements. It is a good tool for finding which bearing is making a sound and the wrong tool for saying how loud that sound is.
It is the international specification for sound level meters, setting tolerance limits on frequency weighting, directional response, time weighting and level linearity. Class 1 is the tighter of the two working grades and Class 2 the more common. A meter that names neither is not necessarily wrong, but nothing about its performance has been declared against a published limit.
If the reading has to persuade somebody, yes. A calibrator produces a known level at a known frequency so you can confirm the meter agrees before and after the measurement, which is the acoustic equivalent of the live, dead, live check on an electrical tester. The Extech 407732-KIT includes one; most handhelds do not.
Because sound level varies enormously with position, because the two meters may use different time weightings and because neither may be calibrated. Reflections off a hard wall can raise a reading several decibels within a metre, and a fast time weighting will show peaks that a slow weighting averages away. Position, weighting and calibration explain most disagreements before instrument quality does.
Two of them are not. The bullet on the 407780A describes an infrared thermometer and the bullet on the 407732 describes a vibration meter, which are copy errors rather than product descriptions. Where that happens we quote only the figures in the product name and mark the rest Not stated, which is why several cells for those two rows are blank.
Sound measurement is one of the few areas where the instrument standard is more important than the instrument. A decibel figure is only meaningful if the microphone response, the weighting filters, the time weighting and the tolerance limits all follow a published specification, because otherwise two meters pointed at the same noise will disagree and neither can be defended.
This is the only listing in the group that names the specification. It states IEC 61672-1:2013 Class 2, which is the international standard for sound level meters, and it states a calibration certificate supplied with the instrument. The listing also names a self-developed condenser microphone, which is the component that actually determines whether a meter meets its class.
What the listing does not publish is the measuring range in decibels, the frequency range, the time weightings offered, the logging capacity or the calibration interval. Class 2 is also the lower of the two working classes; Class 1 has tighter tolerances and is what some regulatory work requires. Before using this for anything formal, confirm which measurement your local rules actually ask for, because the class requirement is usually written into the procedure rather than left to the person holding the meter.
Noise complaints are almost never about the loudest moment. They are about a pattern: a pump that cycles every twenty minutes, a neighbour whose music starts at eleven, a plant room that only becomes audible when the building is quiet. A live reading captures none of that, because the person holding the meter is never there at the right time.
This listing is built the other way around. It states storage of up to 43000 records, viewable both on the unit and on a computer, with export to an Excel file. That turns a decibel meter into evidence. Leaving it running overnight produces a trace that shows exactly when the noise happens, how long it lasts and how it compares with the background.
The listing does not state a measuring range, an accuracy figure, a frequency weighting, a time weighting or a sampling interval, and it names no standard. That is a real limitation for formal work, where the procedure usually specifies both the class of instrument and the averaging method. Use it to establish a pattern and to decide whether a formal measurement is worth commissioning, and be careful about presenting uncalibrated absolute values as though they were compliant measurements.
Most budget decibel meters are sold on their screen and their battery. This one publishes three numbers that actually describe its performance: a 30 to 130 dB measuring range, an accuracy of plus or minus 1.5 dB, and a frequency response from 31.5 Hz to 8 kHz. Whether those figures are independently verified is unknown, but a manufacturer willing to print them is making a claim that can be checked, and that is a better starting point than a manufacturer who prints nothing.
The 1.5 dB figure is the interesting one. It is tighter than the plus or minus 2.0 dB that several competing listings state, and it approaches the sort of tolerance that Class 2 instruments work to, although the listing does not claim any IEC class.
The 8 kHz upper limit is the specification to be aware of. Human hearing extends well past that, and noise sources with significant high frequency content, such as compressed air, bearings, some fans and electronic squeal, will be under-reported by a meter that rolls off at 8 kHz. For household and neighbour noise it is unlikely to matter. For machinery diagnosis it can matter a great deal.
Short answer: the CRYSOUND CRY2831 is the best buy for anything that has to be defended, because it is the only listing here naming IEC 61672-1:2013 Class 2 and supplying a calibration certificate; the DANOPLUS logger is the one that captures a noise pattern nobody is awake to witness, with 43000 records and spreadsheet export; and the Goldeep SL750A is the value pick, publishing range, accuracy and frequency response.
Decibels look like a simple number and are not. A sound level meter applies a frequency weighting, usually A weighting to approximate how human hearing responds, and a time weighting that decides how quickly the display reacts to a changing sound. Change either and the same noise produces a different figure. That is precisely why IEC 61672 exists: it sets tolerance limits on the microphone response, the weighting filters, the directional behaviour and the linearity, so that two compliant meters agree within a stated margin. One listing in this group names the standard and its revision year. The rest describe features. If the number is going into a complaint, a workplace assessment or a dispute, the named standard is the specification to buy.
The Extech 407730-NIST is the other instrument here with a traceability claim, and its listing states 2 dB accuracy with 0.1 dB resolution alongside the certificate. Traceable to a national standard means the calibration can be linked back through an unbroken chain to a reference, which is a real and useful claim. It is not the same claim as compliance with IEC 61672 Class 1 or Class 2, which describes how the instrument behaves across frequency and level rather than how one calibration point was established. Both are better than nothing. Neither stays true forever, because microphones age and drift, which is why a calibration has an interval and why an acoustic calibrator belongs in the case of any meter used regularly.
Three listings publish an accuracy figure and they differ in a way worth noticing. The Extech 407730-NIST states 2 dB with 0.1 dB resolution, the Tadeto states plus or minus 2.0 dB and the Goldeep states plus or minus 1.5 dB. Resolution is not accuracy: a display showing 0.1 dB steps while the instrument is 2 dB out is showing false precision. The Goldeep also publishes a frequency response of 31.5 Hz to 8 kHz, which is the only frequency specification in the group, and it exposes a limitation shared by most budget meters. Human hearing runs well above 8 kHz, and noise sources dominated by high frequencies, including compressed air leaks, failing bearings and electronic whine, are read low by a meter that rolls off there.
Almost every real noise problem is a question of when rather than how loud. A heat pump that runs at night, a pub that empties at midnight, a compressor cycling through a shift: the single highest reading says very little, and a measurement taken during an inspection visit usually misses the event entirely. Two listings here address that. The DANOPLUS states up to 43000 stored records with viewing on a PC and export to a spreadsheet, and the Extech 407732-KIT states datalogging up to 16000 readings with a USB interface for downloading. A trace across a night is far more persuasive than any single figure, and it also establishes the background level, which is the comparison that most noise rules are actually written around.
This group contains a specific trap worth flagging. Two of the Extech listings carry bullet text that belongs to entirely different products: the 407780A bullet describes an infrared thermometer with a thermocouple input, and the 407732 bullet describes a vibration meter measuring acceleration, velocity and displacement. Neither has anything to do with sound. These are listing errors rather than product descriptions, and they are common on long-established catalogue items. The practical rule is to trust the product name and the manufacturer datasheet over a marketplace bullet, and to treat any specification that does not match the product family as absent rather than as information. That is why several cells in those rows read Not stated.
Listings were compared on stated measuring range, stated accuracy and resolution, any named standard or traceable certificate, weighting and frequency response where published, and storage or export. Owner feedback was reviewed for recurring reports of readings that disagree with other meters and units that fail early. We did not run laboratory tests, we publish no measurements of our own, and no figure appears on this page unless the manufacturer published it. Amazon data supplies images, availability and links only.
Twelve devices sorted by what each listing states: WiFi and USB temperature loggers, single-use shipment recorders, an NDIR CO2 meter and a particle counter.
Read Guide→
Nine airflow instruments sorted by what each listing states: a balancing flow hood, hot wire probes for in-duct velocity, and vane anemometers with CFM.
Read Guide→Ten climate instruments sorted by what each listing states: WiFi loggers, dew point psychrometers, wireless weather stations and simple mini gauges.
Read Guide→