Rion NA-28 Sound Level Meter

- Measurement range        
+ A-weighting: 25 dB to 138 dB  
+ C-weighting: 33 dB to 138 dB  
+ Z-weighting: 33 dB to 138 dB
- Frequency range: 10 Hz to 20 kHz
Manganese batteries: R14PU, 6 hours
Alkaline batteries: LR14, 16 hours (10 hours if backlight is continuously activated)
AC adapter: NC-94B
External power supply voltage: 5 V to 6 V (rated voltage: 6 V)
Consumption current    : 230 mA (during normal operation at rated voltage)
Ambient conditions for operation: -10 °C to +50 °C, 10 %RH to 90 %RH
Dimensions, weight: 331 (H) X89(W) X51 (D)mm, approx. 730 g (including batteries)
Supplied accessories    : Memory card (256 MB) MC-25LC1 x 1, Storage case x 1, Soft case x 1, AC adapter NC-94B x 1,  Windscreen WS-10 x 1, BNC-RCA cable CC-24 x 1, Strap x 1, IEC R14P  batteries (alkaline)x 4