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DT-122 is a 2 channel upper/lower limit voltage comparator module. Can be used to monitor the measured voltage. When the measured voltage is within the voltage value of the upper and lower limits, the relay will turn on to check the normal operation of other equipment. Relay Switch Output Dual voltage independent detection The upper and lower limit voltage values can be set independently BUY WITH CONFIDENCE: To provide you with the highest quality service, if you have any question, please feel free to contact us. We will provide after-sales service until you are satisfied.