overload limiter

● Power-on self-test function，Automatically judges whether the input signal is within the normal range and display an error code.

● High precision and accurate digital display.advanced anti-jamming technology overcomes the effects of environmental humidity, strong electromagnetic field interference, zero drift, etc., making it work safe and stable.

● Highlight red digital tube display LED.

● Digital debugging, all data.

● Modified by the display button, good sealing, dustproof and moisture proof.