| 
   | 
  
   
PMMC 
 | 
  
   
MI 
 | 
 
| 
   
Suitable
  for measuring 
 | 
  
   
Direct
  current and voltage 
 | 
  
   
Direct
  and alternating currents and voltages 
 | 
 
| 
   
Method
  of control 
 | 
  
   
Hairsprings 
 | 
  
   
Hairsprings 
 | 
 
| 
   
Method
  of damping 
 | 
  
   
Eddy
  current 
 | 
  
   
Air 
 | 
 
| 
   
Frequency
  limits 
 | 
  
   | 
  
   
20-200
  Hz 
 | 
 
| 
   
Scale 
 | 
  
   
Uniform(Linear) 
 | 
  
   
Cramped
  or Non-linear 
 |