_x000D_ Feature: Handy, Quick and Easy For DTL, TTL and CMOS High Frequescy Response Instant Indication Pulse Memory Function How to use: 1. Connect RED clip to + terminal and BLACK clip to - terminal of the power source of the circuit under test. The supply voltage should not exceed 18V for Dc 2. For TTL and DTL, set the upper select switch to the side marked "TIL" For CMOS, set the upper select switch to the side marked "CMOS", contact the probe pin to the point to be tested. The LEDs will indicate its states: A) ALL LEDs OFF -High impedance B) RED LED ON - High State (1) C) Green LED ON - low State (0) D) Orange LED ON - Pulse 3. For deteching and storing pulse or level transition, set lower select switch to side marked "PULSE" first. Contact the probe pin to the poin to be tested. The LEDs will indicate is basic state. Then set the lower select switch to side marked "MEM", The orange LED will light when any pulse or level transition is detected. The pulse direction, in comparison with the original basic, state, cabe determined. After use, reset probe by setting the lower select switch back to side marked "PULSE" Note: No retail package. Transition: 1cm=10mm=0.39inch. Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 * Probe _x000D_ _x000D_