Features: This meter can measure AC voltage and frequency simultaneously. Can directly connect two wires to the tested object to measure voltage and frequency, do not need power supply. Only suitable for pure AC45-65Hz mains supply, can't be used for measuring circuit of high frequency, inverter output and sine wave. Measuring voltage range: AC 80-300V, testing frequency range: 45.0-65.0Hz The housing is fully enclosed design, safe and reliable. Specifications: Voltage range: AC80V-300V, resolution: 1V Frequency range: 45.0-65Hz, resolution: 0.1Hz Accuracy: 1% Sample cycle: 2 times per second Display: 48 x 24.5mm LED, blue Dimensions: 70 40 30 mm Installation hole: 68 38 mm Package includes: 1 x Voltage & Frequency Meter