1. CLEAR AND INTUITIVE DISPLAY: Digital frequency meter uses a 0.56inch LED font size to display the distribution of data in a concise form, so that can quickly understand the data2. EASY INSTALLATION: The digital display frequency meter has a 68x68mm opening size, possess small size, and can be installed anywhere, very versatile3. WIDE APPLICABILITY: Frequency meter can be used in , such as industrial automation, mechanical and electrical equipment, distribution box, industry, etc., has strong versatility4. TECHNICAL PARAMETERS: Digital cymometer with auxiliary power supply AC 80-500V, frequency measuring range 10-99.9Hz, high measurement accuracy of 1%(2 digits)5. SCRATCH plastic: AC frequency meter adopt excellent plastic material, impact , scratch , suitable for pure AC 50-61Hz mains power supplyItem Type: Digital Frequency MeterModel: For CH 72Power Supply: AC50-500VFrequency Range: 10-99.9HzMeasurement Accuracy: 1% (2 digits)Color: BlackMaterial: plasticPackage Contents:1 x Digital Frequency MeterOnly 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.