Blue LCD digital frequency panel meter. , & high performance. Wide range of 45.0-65.0 Hz, Embedded installation, convenient to use. High precision, durable and accurate. Feature - ColorGrey - Material: LCD+Plastic+Electronic Component. - Size: 7.9 x 3.1 x 4.3cm - Measurement frequency range: 45.0Hz-65.0Hz ( frequency can be measured) - Voltage range: AC80-300V (AC150V-500V: Do not pass through 10 seconds when this instantaneous voltage is 500V, safer within 450V). - Measurement accuracy: 0.5% ± 2 words. - LCD liquid crystal display: word height 20mm. - Mounting hole size is the same as LED 5135 type head. - Backlight optional, blue backlight, green backlight (green light 100 only custom). - Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 3 x Frequency Meter