REED SD-4023 SD Series Sound Level Meter, Datalogger, 30 to 130dB


This SD series sound level meter has triple range measurement and features user selectable sampling rates from 1 to 3600 seconds. Using an SD card (up to 16Gb) a user can select a desired sampling rate and quickly generate an Excel file with raw data, all without the use of software. Optional accessories include a tripod and AC adapter for continuous long-term monitoring and PC software that allows a user to tracking live measurements.


  • High accuracy of ±1.4 dB meets Type 2 standards
  • Triple range measurement (50dB dynamic range)
  • A & C frequency weighting
  • Fast & Slow time weighting
  • Real time data logger with integral SD memory card
  • User selectable sampling rate from 1 to 3600 seconds
  • Large, easy-to-read backlit LCD display
  • Peak hold, Data hold and Min/Max hold
  • Optional PC software features live tracking via USB connection
  • Tripod mount for long-term monitoring
  • Low battery indicator and auto shut off


Measuring Ranges30-130 dB
Low: 30-80dB
Med: 50 -100 dB
High: 80 -130 dB
Full: 30-130 dB
Dynamic Range50 dB (in each range)
Accuracy31.5Hz ± 3.5 dB, 63 Hz ± 2.5 dB, 125 Hz ± 2.0 dB,
250 Hz ± 1.9 dB, 500 Hz ± 1.9 dB, 1 kHz ± 1.4 dB,
2 kHz ± 2.6 dB, 4 kHz ± 3.6 dB, 8 kHz ± 5.6 dB
Resolution0.1 dB
Response Time500ms
Frequency Range31.5 Hz to 8 kHz
Frequency WeightingA, C
Time WeightingFast/Slow (200ms and 500ms)
Microphone0.5" (12.7mm) electret condenser
Display4-digit LCD
Backlit DisplayYes
Data HoldYes
Alarm IndicatorsUnder and Over (visual on-screen)
Datalogging CapabilitiesYes
Real-Time Clock and Date StampYes
Selectable Sampling RateYes (1, 2, 5, 10, 30, 60, 120, 300, 600, 1800, 3600s)
External MemoryYes, expandable up to 16Gb with SD card (optional)
Auto Shut-offYes (after 10 mins/off)
Kick StandYes
Tripod MountableYes
Low Battery IndicatorYes
Power Supply6 x AA batteries or AC Adapter (optional)
OutputYes (AC)
Battery LifeSampling Time Dependent
PC ConnectivityUSB Cable (optional)
Software  SW-U801-WIN Software (optional)
Software OS CompatibilityWindows XP / Vista / 7
Product CertificationsCE, IEC 61672-1 Class 2
Operating Temperature32 to 104°F (0 to 40°C)
Storage Temperature14 to 140°F (-10 to 60°C)
Operating Humidity Range10-90%
Dimensions9.7 x 2.7 x 1.8" (245 x 68 x 45mm)
Weight17.3oz (489g)