BK Precision 735 数字声级计

Frequency range: 31.5Hz ~ 8KHz 
Measuring level range: 30 ~ 130dB 
Dataloger:32000 records.
Frequency weighting: A / C 
Microphone: 1/2 inch electret condenser microphone 
Display: LCD 
Digital display: 4 digits 
Resolution: 0.1dB 
Display Update: 0.5 sec. 
Analog display: 50 segment bargraph 
    Resolution: 1dB 
Display Update: 50 mS 
Time weighting: FAST (125mS), SLOW (1 sec.) 
Level ranges: Lo:  30  – 80 dB 
Med: 50 – 100 dB 
Hi:   80 – 130 dB 
Auto: 30 – 130 dB 
Accuracy:  ±1.5dB (under reference conditions @ 94dB, 1KHz)  
Alarm function: “OVER” is when input is more than the upper limit of range.  
  “ UNDER ” is when input is less than the lower limit of range.     
MAX/MIN hold: Holds readings the Maximum and Minimum Value.  
AC output: 1 Vrms                                
DC output: 10mV / dB
Power supply: One 9V battery
Electromagnetic Compatibility: 
RF field = 3V/m 
Total accuracy = specified accuracy + 0.5dB 
Dimensions (L x W x H): 10.8  × 2.5  × 1.2inch (275  ×  64  ×  30mm)      
Weight: 285g
Accessories: 9V battery, carrying case, Screwdriver, Instruction manual, Windscreen,  software & RS-232 cable