AC Frequency Meter, Yeeco AC 24-500V 0-99Hz Frequency Counter 3pcs Green Red Yellow LED Signal Indicator Light Panel;

Power supply: AC 24-500V
Testing range: 0-99Hz
Size: (length) 51mm x (φ)29mm/2"x1.14"
Install opening: (φ)22mm/0.9"
Height of the display digit: 11mm/0.4"
Life time: 1 million/times

Package include:
3 x Frequency Testers