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![Simpson 890-2 [12890] Sound Level Calibrator](image/cache/wp/gj/Products/Simpson_890-2-800x800.webp "Simpson 890-2 [12890] Sound Level Calibrator")
The Simpson 890-2 Sound Level Calibrator (hereafter referred to as the 890-2, or simply the Instrument) is an accurate, portable sound source designed specifically for convenient field calibration of the Simpson Models 884-2, 886-2, 899 or other compatible Sound Level Meters (SLM). Its compact, rugged construction and battery powered operation permit its use in virtually any location. When acoustically coupled to a Sound Level Meter the 890-2 provides a constant, calibrated sound pressure level of 114 dB or 94 dB (0 dB reference is 20 μ Pascals) at the microphone of the Sound Level Meter.
The sound pressure accuracy is ± 0.5 dB at 23°C and 760 mmHg. The sound frequency is 1,000 Hz. The case of the Instrument is constructed of aluminum and designed to minimize loss when coupling the transducer cavity to the SLM microphone
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![Simpson 897 [12645] Universal Universal Noise Dosimeter](image/cache/wp/gj/Products/Simpson_897-200x200.webp "Simpson 897 [12645] Universal Universal Noise Dosimeter")
