A Manual telling how to use this electronic instrument to measure sound frequencies. 

 - [s.l.] :   Conn Corporation ,   s.f.. 
 - [18] p. ;   29 cm. 
<br/><br/> Engrapado.  Fotocopia. 
<br/><br/>Detailed Description -- Preparation for use -- Inspection, Lubrication, Maintenance -- Repair and service policy -- Accessories and replacement parts 
<br/><br/><label>Dewey Class. No.: </label>301