1. Support dual-channel signal input 2. Support 18 adjustable frequency levels, 9 adjustable internal resistance levels 3. Adjustable B channel position 4. Support A channel or A+B channel display 5. Support trigger signal output (5V) High safety: ASA testing does not require the circuit board to be powered on; ASA testing does not involve circuit principles and does not require the circuit to be in working condition Strong adaptability: ASA testing does not involve the functions of components on the circuit board, so no matter what type of components the circuit is composed of, including digital, analog, mixed digital and analog, etc., it can be tested. Built-in 3000mah lithium battery, using TYPE-C interface 2.0 inch TFT color screen display Automatically shut down if no operation is performed within 15 minutes Voltage: 4V Internal resistance: 50R, 500R, 1K, 2K, 3K, 4K, 5K, 6K, 7K adjustable Frequency: 20Hz, 100Hz, 500Hz, 1kHz, 2kHz, 3kHz, 4kHz, 5kHz, 6kHz, 7kHz, 8kHz, 9kHz, 10kHz, 11kHz, 12kHz, 13kHz, 14kHz, 15kHz adjustable Note: 1. The blue terminal is a multiplexed port. When the A channel is the default, the blue terminal outputs a 5V pulse voltage with an interval of 1 second. After the A+B channel is turned on, the blue terminal becomes the B channel signal 2. Do not measure with power on! Before using this product, you need to discharge the object to be measured. Colour:As Shown Material:plastic Package Contents: 1 x tester 1 pair x test leads 1 pair x test clips 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.