Handheld ASA VI Curve Tester 2 Channel 4 Gear Circuit Board Test Device [Extensive Applications]: Test both simple and complex circuit boards, offering a convenient method for testing the functionality of discrete components. [Broad Compatibility]: Effectively test circuit components of any composition or functionality, bypassing limitations imposed by packaging. [Convenient and Testing]: Test circuit boards without the need for power, ensuring safety and allowing for separate testing of detached boards. Spec: Item Type: VI Curve Tester Material: ABS Display: 1.3 inch Organic Light Emitting Diode Battery: Rechargeable lithium battery 3000mAh x 1 [Shipped with built in battery] 4 Internal Adjustable: 56R, 470R, 1.5K, 20K 4 Test Frequencies: 50Hz, 300Hz, 2kHz, 13kHz Curve Motion: Support Scanning Function: Supported True Dual Channel: Support Synchronous Display: Supported Program Control: Support Package List: 1 x Tester 2 x BNC Cable 2 x Test Cable 1 x USB Cable How To Use: VI and multimeter method types, but the multimeter voltage is lower, the instrument uses AC to excite the circuit node. Because the amplitude and frequency can be adjusted, the amplitude close to the operating voltage can be used for excitation, and the measured graph is more real. You can find faulty nodes by comparing them. Due to current applied to the component, this does not affect or damage any component. ASA has many advantages and has been proven to be a fast and effective fault diagnosis .