High quality of RF-04 double sided material.
Area: 5 cm x 4 cm nickel plate on side,
Anti-oxidation, anti-conductivity, for long use time.
Potentiometer adjust the sensitivity;
Working voltage 5 volts
Output format: Digital switching output (0 and 1) and analog voltage output AO;
With bolt holes for easy installation;
Small board PCB size: 3.2cm x 1.4cm;
Uses a wide voltage LM393 comparator.