Description:  The main function of this AC mains noise tester is to display the current voltage and noise voltage of the mains through the panel's OLED dot matrix screen. In this way, everyone can see the current state of the mains power very intuitively, and have an accurate judgment on the quality of the power supply.    Features:  - OLED screen displays noise voltage and AC voltage  - There are small speakers that can directly amplify the noise output, and judge the noise intensity and frequency by sound  - Plug directly into a wall socket (power socket)  - The speaker plays EMI sounds and amplitudes are demodulated to identify EMI sources (such as AM or shortwave radios, motors and arcs)    Specifications:  - Input voltage: AC 85Vac - 250Vac 50/60Hz (Accuracy: ±1 VAC)  - Frequency Range: 10KHz - 10MHz  - Noise Range: 1mV - 1999mV  - Measurement Accuracy: ±5% @ 1MHZ; +5% to -50% @ 10 KHz to 10MHz  - Noise Indication: 4 digits yellow and blue two-color OLED digital dot matrix display  - Dimensions: 132 x 91 x 41mm  - Machine weight: 150g    Package Included:  - 1 x Mains Noise Analyzer  - 1 x 0.8m AC Power Cable