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2-Pt. Acoustical Calibrator - Class 2

Marsoni M251S
Sale price$187.00
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2-Pt. Acoustical Calibrator - Class 2For calibration of all Sper Scientific digital sound meters or any sound level meter with 1 or microphone. Conforms to ANSI S1. 40 1984 and IEC942 1988 Class 2 standards for acoustical calibrators. Simply place the calibrator on to the digital sound meters microphone, turn on the calibrator, and adjust the decibel meters reading to either 94 or 114 dB. Operates at a frequency of 1KHz 4% and with an accuracy of 0. 5 dB. Built in battery check. Easily
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  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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4.6 ★★★★★
Based on 905 reviews
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Coreen Jurson
Fort Morgan, US
★★★★★ 5
Love it!
Size: 5-Tier (Not included planks), Size: 5-Tier (Not included planks)
Years later it is still holding up! Don’t mind the mess! Worth it! Good size! And once it was up it was easy to put together! Love the style!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 26, 2025
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Verified Purchase
JESSICA
Los Angeles, US
★★★★★ 5
Easily assembled.
Size: 3Pack of 5 Tier (Not included planks)
Easily assembled, seems sturdy and built to last. Once attached to wall seems even sturdier than expected. Anchor pieces included but I choose to find studs to anchor to.
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Reviewed in the United States on November 12, 2025
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Verified Purchase
James Collier
Lowell, US
★★★★★ 3
Good but misleading size
Size: 3Pack of 5 Tier (Not included planks)
Sturdy set for shelving. However dimensions are misleading. Not sure if they sent the incorrect size but the vertical distance between shelves was 11” and that’s without the shelving installed
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 17, 2026
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Verified Purchase
Sara
Louisville, US
★★★★★ 5
Worked for pantry
Size: 3Pack of 5 Tier (Not included planks), Size: 3Pack of 5 Tier (Not included planks)
These turned out perfect t for a pantry. Just fyi get better dry wall anchors and you’re golden! Definitely takes two people to put up tho!
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Reviewed in the United States on February 14, 2026
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Rich
Charlottesville, US
★★★★★ 5
Buy it.
This is not merely another guide to intensive care. Well-organized and detailed, it hits the right note between the things a beginner has to know (and probably has some idea about) and the things a beginner needs to know (but is clueless). It even includes a chapter on burnout. Recommended for everyone new to the ICU, and also everyone who has been around awhile. I’m going to get a lot of use from this text, I can already tell.
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Reviewed in the United States on June 19, 2018

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