Fangrui Product Details Black Aluminum Alloy Shell, Mechanical Style, Good Texture, Not Low-grade Printed Products, Digital Display Mechanical Dial, Accurate Measurement, Real-time Feedback, Circular Design, Data Display Is Clear At A Glance Tight Packaging, Embedded Hygrometer + Embedded Pneumatic Connector, Tight Installation, Good Sealing Can Be Installed On Tube, Different From Other Hygrometers, Can Be Installed On Tube, And Humidity Detection In This Space Is More Accurate Due To Different Batches, There May Be Differences In Product Appearance, Color, And Printed Text, Which Not Affect The Use. Colour:black Material:aluminum Alloy Package Contents: 1 * Filament Humidity Detection Module 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.