appearance industrial design. AC50-500V 10-99.9HZ. Display and frequency at the same time. Small size is easy to carry and use. The LED AC voltage frequency measuring instrument is mainly used for real-time measurement of the AC voltage frequency in the electrical circuit, and uses the LED digital tube display to display in digital direct reading mode. It is widely used in substation automation, power distribution automation, testing equipment, voltage stabilizers, inverters, voltage regulator motor equipment and other occasions. The product has high precision, high stability, high reliability, low power consumption, small size and easy installation. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:Black Material:ABS Package Contents: 1 * Digital Voltmeter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.