1. This operational amplifier tester is used to evaluate the quality of operational amplifiers. Its operating voltage is 5.5V-28V 2. Insert the power plug into the power socket, the tester will emit a short beep, the indicator light will flash for about 3 seconds, and then the tester starts working 3. If you want to detect chip components, you can put the chip components into the test socket with tweezers 4. After putting in the item to be tested, press the start button and the tester starts working 5. The LED indicators (pass and damage) on the panel will show whether the operational amplifier has passed the test The four-channel operational amplifier tester is mainly used for the detection and maintenance of industrial control equipment circuit boards and complex instruments Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Color: As shown Material: aluminum alloy Package Contents: 1 x Operational Amplifier Tester Only the above package content, other products are not included. 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.