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 emit a short beep, the indicator light 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, the start button and the tester starts working 5. The LED indicators (pass and damage) on the panel 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 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.