LP-2800/LP-3500 Logic Probe

Common Specifications
1.  Input impedance 1MΩ
2.  Width of min. pulse : 30ns
3.  Max. input frequency : 17MHz
4.  Measurable logic gate
     (1) Logic 1 (red LED lights) and buzzer :
           TTL : 2.3V ±0.2V 
           CMOS : 70%Vcc
     (2) Logic 0 (green LED lights) and buzzer : 
          TTL : 0.8V ±0.2V  
          CMOS : 30%Vcc
5.  Input overvoltage protection : ±220V DC / AC 15sec
6.  Pulse (yellow LED) flashing time : 500ms
7.  Power supply protection : ±20V

Special functions for LP-3500
1.  ABS case
2.  Two audio tones
3.  Two external terminals
     They are also available for LP-2800 but at an extra charge.