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 data 2. EASY INSTALLATION: The digital display frequency meter has a 68x68mm opening size, possess small size, and can be installed anywhere, very versatile 3. WIDE APPLICABILITY: Frequency meter can be used in , such as industrial automation, mechanical and electrical equipment, distribution box, industry, etc., has strong versatility 4. 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 supply Item Type: Digital Frequency Meter Model: For CH 72 Power Supply: AC50-500V Frequency Range: 10-99.9Hz Measurement Accuracy: 1% (2 digits) Color: Black Material: plastic Package Contents: 1 x Digital Frequency Meter 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.