Handy, Quick and EasyFor DTL, TTL and CMOSHigh Frequescy Response IndicationPulse Memory FunctionHow to use:1. Connect RED to + terminal and BLACK to - terminal of the source of the circuit under test. The supply voltage should not exceed 18V DC2. 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 logic states:A. ALL LEDs OFF -High impedanceB. RED LED ON - High State (1)C. Green LED ON - low State (0)D. Orange LED ON - Pulse3. 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 "", 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" Colour: whiteMaterial: plasticSize: 14 x 3cmPackage Contents:1 x Logic ProbeOnly the above package content, other products are not included.Note: Light 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.