Handy, Quick and Easy_x000D_ For DTL, TTL and CMOS_x000D_ High Frequescy Response_x000D_ Instant Indication_x000D_ Pulse Memory Function_x000D_ How to use:_x000D_ 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 DC_x000D_ 2. For TTL and DTL, set the upper select switch to the side marked "TIL"_x000D_ 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 logic states:_x000D_ A. ALL LEDs OFF -High impedance_x000D_ B. RED LED ON - High State (1)_x000D_ C. Green LED ON - low State (0)_x000D_ D. Orange LED ON - Pulse_x000D_ 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 logic probe by setting the lower select switch back to side marked "PULSE"_x000D_ Colour: grey_x000D_ Material: plastic_x000D_ Size: 14 x 3cm_x000D_ _x000D_ Package Contents:_x000D_ 1 x Logic Probe_x000D_ Only the above package content, other products are not included._x000D_ Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_