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Extech · Extech 407732 Type 2 Digital Sound Level Meter 35 to 130 dB | ANSI/IEC 651, dual range, A/C weighting, fast/slow, data hold, max hold, windscreen, 9V battery
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The Extech 407732 is the only sound level meter in this review, and the listing gives it a Type 2 class with a 35 to 130 dB range. The trade-off is documentation. Three of the five bullets describe acceleration, velocity, displacement, RPM and a remote vibration sensor on a cable, which is a vibration meter, not a sound level meter. The title and the dB range are the only sound-specific data published. If you need a Type 2 meter and can work from the title and range alone, the Extech Type Sound is the pick. If you need published A/C weighting, time weighting, or accuracy tolerance, the listing does not provide them, and you should compare against other sound level meters before committing.
The Bullet Mismatch Is the First Thing to Understand
The title says Type 2 digital sound level meter, 35 to 130 dB. The bullets say acceleration, velocity and displacement, plus RPM and linear surface speed, a remote vibration sensor on a 39-inch (1 m) cable, a 10 Hz to 1 kHz frequency range, RMS or peak modes, and 1000-reading store/recall. Those are vibration meter functions. A sound level meter measures air pressure variation with a condenser capsule and frequency weighting networks. A vibration meter measures motion with an accelerometer. The two instruments share a display and a box, not a sensor.
This matters because the buyer cannot use the bullets to confirm sound-specific behaviour. A/C weighting, fast/slow time weighting, max hold, and the accuracy tolerance that defines Type 2 are not stated in the listing. The 35 to 130 dB range is published, and Type 2 is named in the title, but the tolerance behind that class is not reproduced in the bullet text. Treat the title and the range as the reliable data, and treat the vibration bullets as belonging to a different product description that has been attached to this listing.
The practical consequence is that you are buying a known model name and a known range, not a fully documented sound instrument. For a buyer who needs a Type 2 meter for a specific compliance task, that is a real limitation. For a buyer who needs a recognizable sound meter for general level checks and can verify the weighting options on the unit itself, the trade-off may be acceptable.
What 35 to 130 dB Means in the Field
The decibel scale is logarithmic, so the 95 dB span from 35 to 130 dB is not a linear ruler. Each 10 dB step is a tenfold increase in sound intensity. The bottom of the range, 35 dB, sits around a quiet bedroom or a library. The top, 130 dB, is roughly the threshold of pain and is above the level of a chainsaw at close range. A meter that covers both ends without a range switch is useful because you do not have to guess the range before you press the button.
Where the range runs out is at the extremes. Below 35 dB, the meter has no published floor, so you cannot use it to verify an anechoic chamber or a very quiet HVAC closet. Above 130 dB, the listing gives no ceiling, and you should not assume the meter will read a jet engine or a close-range impact without damage. For most building, workplace and neighborhood noise checks, the published span is adequate. For industrial high-level noise, it is not the right instrument.
The listing does not publish the frequency weighting or the time weighting. Those two settings change the number on the display more than the range does. A-weighted readings are shaped to match human hearing at moderate levels, and C-weighted readings retain more low-frequency energy. Fast and slow time weighting change how quickly the display follows a transient. Without those details, the buyer should plan to read the front panel and the manual, not the product page.
The Type 2 Class and the Tolerance You Are Not Given
Sound level meters are classified by their accuracy tolerance. Type 2 is the general-purpose class, less tight than Type 1, and is the usual choice for workplace surveys, community noise checks and general environmental monitoring. The title states Type 2. The listing does not publish the tolerance in decibels, the reference conditions, or the standard the class is claimed against. That is a gap a buyer should notice, because the class name is only useful if the tolerance behind it is stated.
For a buyer comparing meters, the honest position is that Extech Type Sound gives you the class name and the range, and nothing more on accuracy. If your work requires a calibration certificate or a stated tolerance, the listing does not provide either. You would need to confirm them with the supplier before purchase. The instrument may well carry them, but this page cannot claim them on the listing’s behalf.
This is the trade-off in its clearest form. A Type 2 meter is a useful general instrument, but the class is a promise about accuracy, and a promise without a published number is only as good as the manufacturer’s documentation. The buyer who needs the number should not buy on the title alone.
Calibration, Maintenance and the Questions the Listing Leaves Open
Sound level meters drift, and the usual field practice is to check the meter against an acoustic calibrator before and after a measurement session. The listing does not state whether the 407732 accepts a standard 1-inch or 1/2-inch calibrator, and it does not publish a calibration interval. Those are questions for the supplier. A meter that cannot be checked in the field is a meter whose readings you cannot defend later.
The maintenance nobody mentions is the capsule. The microphone opening collects dust, and a dirty capsule reads low and unevenly. The listing gives no capsule cleaning instructions and no windscreen specification. A foam windscreen is standard practice outdoors, but the listing does not state whether one is supplied. Buyers should assume they will need to source one and should confirm the capsule diameter before ordering.
Battery type and battery life are also not stated. The store/recall function for 1000 readings is published, but the listing does not say whether those readings survive a battery change. If you plan to use the memory for a survey, confirm that before relying on it. For long-term logging, a sound level meter is the wrong instrument anyway; a dedicated environmental data logger is the better fit.
Where This Meter Fits, and Where It Does Not
The 407732 fits the general-purpose role: a technician checking room noise, a safety officer taking a spot reading, a homeowner documenting a noisy neighbor or a piece of equipment. The 35 to 130 dB range covers those cases, and the Type 2 class is the right class for them. The store/recall function is useful for a walk-through where you want to capture a series of spots without writing each one down.
It does not fit work that needs a published tolerance, a calibration certificate, or documented weighting settings. It does not fit very quiet or very loud environments outside the stated range. It does not fit long-term unattended monitoring. And it does not fit vibration measurement, despite the bullets, because the title and the range describe a sound meter and the vibration bullets belong to a different product. If you need vibration analysis, this is not the listing to buy from.
For a broader view of the category and how Type 2 meters compare, the sound level meter buying guide sets out the questions to ask. The short version is that the class, the range and the weighting options are the three specifications that decide whether a meter is right for the job, and this listing publishes only two of them clearly.
The Trade-Off, Stated Plainly
The Extech 407732 is a Type 2 sound level meter with a 35 to 130 dB range, and that is the reliable part of the listing. The rest of the bullets describe a vibration meter, so the buyer is trading documentation certainty for the Type 2 class and the published range. If you need a general-purpose meter for spot checks and can confirm weighting and calibration support with the supplier, it is a reasonable candidate. If you need published tolerance, a calibration certificate, or sound-specific feature detail from the page itself, the listing does not give it, and you should compare against other meters before buying. No laboratory testing was performed for this review, and no measurements of our own are published.
Recommended Tools
Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.
Frequently Asked Questions
Is the Extech 407732 a sound level meter or a vibration meter?
The title and the 35 to 130 dB range describe a sound level meter. Three of the five bullets describe a vibration meter, including acceleration, velocity, displacement, RPM and a remote sensor on a cable. The bullets appear to belong to a different product. Use the title and the range as the sound meter data, and do not rely on the vibration bullets for sound measurement.
Does the listing state the accuracy tolerance for Type 2?
No. The title states Type 2, but the listing does not publish the tolerance in decibels, the reference conditions, or the standard the class is claimed against. Confirm those with the supplier before buying if your work requires a stated tolerance.
Does it have A and C weighting?
Not stated in the listing bullets. A and C weighting are standard on sound level meters, but this listing does not publish them. Check the front panel or the manual before relying on either setting.
Can I use it outdoors?
The listing does not state whether a windscreen is supplied or what capsule diameter it uses. Outdoor measurement usually needs a foam windscreen, so confirm the capsule size and source one before field use.
Does the 1000-reading memory survive a battery change?
The listing publishes store/recall up to 1000 readings but does not state whether the memory is retained without power. Confirm with the supplier if you plan to rely on the memory for a survey.
Is it suitable for long-term noise monitoring?
No. A handheld sound level meter is a spot-check instrument. For unattended logging, a dedicated environmental data logger is the correct tool, and this listing does not publish logging or output features.
Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.
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