| External TTL Input | High > 4.5V (RM-1501) | 
| Display | 5 digits 99999 counts | 
| Sampling Rate | 0.7 second ( > 60 rpm) > 1 second ( 10 to 60 rpm)
 | 
| Measuring Distance | 50 to 300mm | 
| Time Base | 4.0 MHz Quartz Crystal | 
| Range Selection | Automatic | 
| Battery | Four 1.5V batteries (AA, UM-3) | 
| Power Consumption | 1.5mA(Idle) 5mA ( 1000.0 - 99999 rpm )
 25mA (10.00 - 999.99 rpm )
 25mA (Max, Min or Ave Enabled)
 25mA (Event Counter)
 | 
| Auto-Power-Off | 30 minutes. | 
| Operating Temp. | 0 ℃ ~ 50 ℃ ( 32 ℉ ~122 ℉ ) | 
| Size | 72 mm x 63mm x 36mm (6.8" x 2.5" x 1.5") | 
| Weight | 190g (6.7 oz.) (including battery) | 
| Accessories | Carrying Case x 1 ,Reflective tape x 1 , Instruction Manual x 1 (Software & RS-232 interface for RM-1501)
 | 
| Optional accessories | RM-1502 Contact Adaptor |