Features 
 + Produces two signals, 250 Hz or 1,000 Hz at a sound pressure  
level of 114 dB
 +Simply insert the microphone of your instrument, select the correct 
signal from the one-button keypad, and calibrate
 +Conforms to the requirements of IEC 60942 (2003-01) for sound 
calibrators and ANSI S1.40-2006 (R2011): specifications and 
verification procedures for sound level meters

Conforms to standards
 +   Enables confident use in a wide range of 
applications and conditions
 +  Meets the requirements of IEC 60942 (2003)    
for sound calibrators and ANSI S1.40-2006 
(R2011) for sound calibrators 
One-button simplicity
 + Single On/Off/Function key assures ease  
of use
 +     Makes calibrations fast and trouble-free
 Designed for efficient operation
 +   Low battery icon indicates when  
replacement is needed, to help prevent  
service interruption
 +   Auto-OFF function powers down 4 minutes 
after last key press, reducing power drain  
and maximizing battery life (approximately 
18 hours)