LP-2800/LP-3500 Logic Probe

Common Specifications
1.Input impedance 1MΩ
2. Width of min. pulse : 30 ns
3. Max. input frequency : 17 MHz
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.