This hand-held digital logic probe provides convenient and precise use in the measurement of logic circuits.

It displays logic levels (high or low), pulses and voltage transients down to 25 nanoseconds. 

High intensity LED readouts provide instant response to the logic state.

Tests all logic families TTL/LSI, and CMOS/MOS digital circuits. 

Introduction
This unit is a logic troubleshooting instrument which gives visual (LED light) and audio indications for logic levels and pulses. 
It can also capture positive or negative events as short as 30 nanoseconds. 

Operation Instruction 
1.Connect the black alligator clip to ground or common of the circuit to be tested, the red alligator clip to Vcc of the circuit. 
2.According to the type of logic to be tested, select TTL or CMOS with the TTL/CMOS switch. 
Note: The level is nominal 0 to 5 VDC, and CMOS levels are 0 to 5-15VDC . 
For Pulse or Logic level testing, set the PULSE/MEM switch to PULSE position 
3.Touch the probe tip to the circuit point to be tested, The unit will give LED and sound indications indicating the logic level or signals. 
4.Setting the PULSE/MEM switch to MEM position allows the unit to capture a positive or negative pulse, the yellow LED will light and PULSE position. 

Electrical Specification 

Note:

• Dont use the unit if it is damaged or operates abnormally.
• Dont ground youself when you use the unit.
• To avoid electric shock,dont touch any naked conductor with hand or skin.
• Do not operate the meter around explosive gas,vapor,or dust.
• Never exceed the unit’s limits or the ratings specified in the “Electrical Specifications” section.
• To avoid damage to the unit,do not input more than 40V AC or DC.
• Before use,verify this unit’s operation by measuring known signals.