• Amplifier frequency range: 2 or 10Hz to 70kHz
  
• Measures RMS value of signals with crest factor up to 40
  
• Compact, battery operated
  
• Can be used for sound & vibration with appropriate accessories
  
• Has standard weighting filters
  
• Conforms with IEC R179 and IEC R179A and ANSI Type 1

Option 4152 (Artificial Ears) features:

• Conforms to IEC126, ANSIS3.7 - 1973, and NBS9A
  
• Used with 1” Microphone Type 4144 and Preamplifier Type 2669
  
• 2 cm³ Coupler DB0138, 6cm³ Coupler DB0161, and 6cm³ Coupler DB0909 for measurements on insert type hearing aids, earphones and headphones