Hello, the equipment came with a certificated paper of conformity or similar? Thanks

My unit did not include any form of certification. Hope this helps.

I am not interested in a Cert of conformity, does the unit come with a calibration certificate?

Hi, the unit doesn't come with calibration certificate, we can do the calibration certificate if you need but with extra cost. Please send email to us if you need to do the calibration certificate, we will quote you the price.

Hi at what distance from which point of the device should SPL be measured?

As noted, the level produced depends the VOLUME of the calibrator CHAMBER, hence how well the microphone fits into it. There is a small "stop" at the base of each microphone adapter. With just the microphone adapter in place and no microphone, it's very soft even close to your ear. 1. Insert the microphone to the point that it stops 2. Turn on the calibrator to the required level, 94 dB is the more common 3. Set the meter to "A" weighting 3. Adjust your meter as appropriate 4. Repeat for the second level and with both "A" and "C" weighting if the meter has both. Make notes of any differences for future reference.

On the digital sound level meter calibrator nd9 is there any way i can get a users manual emailed to me?

Hi, please find the quick user guide from the link below. LINK: https://www.cd50.net/wp-content/uploads/2022/01/ND9_E.pdf

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🎧 Calibrate like a pro, wherever you go!

BATTERY SMART - Includes 2 AA batteries with auto power-off to extend usage and reduce downtime.
COMPACT PORTABLE - Sleek 60x130x37.5mm design weighing just 400g—perfect for on-the-go professionals.
STABLE BENCHTOP DESIGN - Ensures steady positioning during calibration, minimizing errors and maximizing reliability.
TRIPLE LEVEL PRECISION - Calibrate your sound meters at 94dB, 104dB, and 114dB with 1kHz frequency for unmatched accuracy.
USER FRIENDLY LED INDICATORS - Green LED confirms calibration readiness and level; red warns low battery—never miss a beat.

The Professional Sound Level Calibrator offers three precise calibration levels (94dB, 104dB, 114dB) at 1kHz frequency, housed in a compact, portable design with a 13.2mm cavity for microphone insertion. Featuring intuitive LED indicators and an auto power-off function, it ensures reliable, efficient calibration for sound level meters anytime, anywhere.

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Manufacturer	Gain Express Holdings Ltd
Part Number	8930B
Item Weight	12.3 ounces
Product Dimensions	377.95 x 78.74 x 157.48 inches
Item model number	8930B
Batteries	2 AA batteries required. (included)
Is Discontinued By Manufacturer	No
Size	Dimension: 60 x 130 x 37.5mm
Color	114db / 94db / 104db Calibrator
Item Package Quantity	1
Special Features	Calibration frequency at 1K Hz with three level 114dB, 94dB and 104dB, Vivid LED display with stability and low power indicator
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

Professional Sound Level Calibrator Decibel Meter Calibration with Three Calibration Level at 94dB & 104dB & 114dB, SPL Meter Calibrator for dB Noise meter

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