Item Description
Up for sale is this Brüel & Kjær Type 4930 Artificial Mastoid Acoustic Calibrator w/ Accessories
The Brüel & Kjær Type 4930 Artificial Mastoid is a precision electroacoustic calibration instrument designed for the testing and calibration of bone-conduction hearing aids, audiometer bone vibrators, and related transducers. It simulates the mechanical impedance of the human mastoid and incorporates a built-in force transducer for accurate and repeatable measurements. The Type 4930 is widely regarded as the industry standard for bone-conduction calibration.
Key Features & Specifications:
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Brand: Brüel & Kjær (B&K)
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Model: Type 4930
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Type: Artificial Mastoid / Acoustic Calibrator
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Built-in force transducer
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Simulates human mastoid mechanical impedance
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Adjustable static force: 2 N to 8 N
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Frequency range: 50 Hz to 10 kHz
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Compliant with IEC 60318-6 and related audiometric standards
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Designed for precision laboratory and audiology measurements
Applications:
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Calibration of bone-conduction audiometers
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Testing bone-conduction hearing aids
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Audiology laboratories
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Hearing aid manufacturing
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Research and development
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Electroacoustic measurement systems
Dimensions & Weight:
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Height: 165 mm (6.5 in)
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Width: 205 mm (8.1 in)
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Depth: 134 mm (5.3 in)
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Weight: 3.4 kg (7.5 lb)
Included Accessories (when present):
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Spring Balance UA-0247
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Level Indicator UA-0262
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Slide Rule QH-0006 with case
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Additional accessories as shown in photos
Condition
- Fully tested & functional
- Great cosmetic condition
Note: No other accessories are included except those shown in the photos. What you see is what you will receive.
*Free shipping applies only to the following locations; additional shipping fees will apply to other destinations:
Payment
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- Payment must be received within 2 business days of auction closing.
Shipping
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- Delivery time depends on destination and other factors. Average delivery time to the U.S. is about one week. Canadian buyers should receive their item within 5 business days.
International Buyers ? Please Note:
- It is your responsibility to ensure that this item can be legally imported into your country and to provide any necessary documents required by your local customs office. Failure to do so means you accept responsibility for any consequences, including but not limited to loss or damage of the item, additional shipping costs, or delays resulting from insufficient information or customs clearance procedures.
- Import duties, taxes, and charges are not included in the item price or shipping cost; these charges are the buyer's responsibility.
Warranty & Returns
- All our items are guaranteed to be in working condition for 30 days, unless otherwise specified.
- No warranty is offered on items sold for parts or listed as defective.
- To obtain a replacement or a full refund, the item must be shipped back to us in its original condition.
- Each item's serial number is recorded to prevent fraud. Returns will only be accepted if the serial number matches our records.
- Each item bears a warranty sticker. The sticker must be intact and untampered with to qualify for a replacement or refund.
We strive to provide a pleasant buying experience. If you encounter any issues with your item, please contact us, and we will work to resolve them promptly.