Low-Cost Meter Eyes AC Line Frequency

The Model UP416ACF three-digit, LED panel meter monitors ac line frequency between 30 to 80 Hz with an accuracy of 0.5% ±1 digit. The meter is powered directly from the ac line and consumes less than 5W.By using a step-down transformer input, the meter can monitor a remote power-line frequency. Pricing is $49.50 with delivery from stock to six weeks.