... models, system will test the voltage, if the voltage is 12V, display “0”, if the voltage is 24V, display “1 ... , Prevent corrosion; - 12V/24V auto recognize; - LED Digital display and waterproof button, easy to use; - Use advanced technology, one time equalizing ... temperature sensor, high precision temperature compensation; - With power fail auto-save function. No reset need. Easy to use; - Various ...