Spark detector, also known as spark leak detector, spark leak detector, etc. The instrument is mainly used to detect whether there are pinholes, trachoma and other defects on the thick non-conductive matrix of metal substrate. The instrument is very simple to use, one end grounding, the other end is the probe, (probe form many carbon brush type, circle spring type, flat rubber type), the instrument through the high voltage probe out of DC high voltage, when the probe through the defect of the coating surface, the instrument will automatically sound and light alarm.