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 — precision sound checks that keep you ahead of the curve!

ENERGY SMART OPERATION - Auto power-off feature maximizes battery life so you stay focused on the job, not the charge.
COMPACT POWERHOUSE DESIGN - Lightweight (400g) and portable with a benchtop form factor for stable, on-the-go calibration.
CRYSTAL CLEAR LED FEEDBACK - Vivid green and red LEDs keep you informed on power, calibration status, and battery health.
MICROPHONE SAFE PRECISION FIT - 13.2mm cavity ensures perfect mic alignment, preventing damage and guaranteeing reliable results.
TRIPLE LEVEL CALIBRATION MASTERY - Switch seamlessly between 114dB, 104dB, and 94dB at 1kHz for pinpoint accuracy.

The Professional Decibel Meter Calibrator offers three precise calibration levels (114dB, 104dB, 94dB) at 1kHz frequency, housed in a compact, portable benchtop design. Featuring a 13.2mm cavity for safe microphone insertion, a backlit LED display with clear status indicators, and an auto power-off function, this device ensures accurate, reliable sound level calibration with extended battery life using included AA batteries.

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Manufacturer	Gain Express Holdings
Part number	8930B
Item Weight	480 g
Product Dimensions	960 x 200 x 400 cm; 480 g
Batteries	2 AA batteries required. (included)
Item model number	8930B
Size	Dimension: 60 x 130 x 37.5mm
Colour	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
tech_spec_battery_description_toys	battery_type_aa

Professional Decibel Meter Calibrator, Digital Sound Level Meter with Backlight Display High Accuracy (114dB / 94dB / 104dB Calibrator)

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