|  Specifications | 
          
            | Model | PDN-21 | PDN-51 (Discontinued) | 
          
            | Range | 20mm | 50mm | 
          
            | Resolution | Convertible 0.01mm and 0.001mm ( Set 0.001mm at the time of shipment ) | 
          
            | Accuracy (excluding quantized error)
 | 0.001mm Display: 0.003mm 0.01mm Display: 0.01mm
 | 0.001mm Display: 0.004mm 0.01mm Display: 0.01mm
 | 
          
            | Measuring force | Less than 1.5N Without spring: less than 0.31N
 | Less than 4.0N Without spring: less than 1.0N
 | 
          
            | Response speed | 1000mm/sec | 
          
            | Contact point | X-2 ( M2.5×0.45 ) | X-9 ( M2.5×0.45 ) | 
          
            | Display rotation | 280º | 
          
            | Operating temperature | 0 - 40ºC | 
          
            | Functions
 | 
 
              
                
                  |  Convertible 0.01mm and 0.001mm |  
                  |  Judgement    OK, ±NG   ( OK=Green ±NG=Red
                  ) |  
                  |  Counting direction Conversion |  
 | 
          
            | Data output | RS-232C | 
          
            | Power supply (AC Adapter) | AC100 - 240V }10%  50/60Hz | 
          
            | Accessories |  AC Adapter |  AC Adapter  Finger Lever No.LL-50 
 | 
          
            | Options
 | 
 
              
                
                  | for PDN-21 | for PDN-21/51 |  
                  |  Flat Back | No.GB-3D20 |  Input adapter | No.IF-21 |  
                  |  Release | No.RE-4L |  Foot switch | No.FW-1 |  
                  |  Finger Lever | No.LL-D20 |  Change the measuring force |  
                  |  Lifting Lever | No.LL-PD |  |  
 |