XQ-300YD Watertightness Tester 
I. Application scope of the watertightness tester: 
The main function of this device is to be used for household toothbrush appliances, electronic products, etc. When these products are tested under simulated negative pressure conditions, they can be observed through the plexiglass viewing window to test their physical and other related properties. After the test, the performance of the product is determined through verification to ensure it meets the requirements, facilitating the design, improvement, verification and factory inspection of the product. 
two Main parameters of the watertightness tester: 
II. Overall dimensions of the equipment: 
1.Approximately 500mm in length, 300mm in width, and 300mm in height. 
2. Internal dimensions of the equipment: Diameter 300mm x Height 300mm 
3. Test pressure: Negative pressure 5 - 30 Kpa 
4. Time control: Adjustable from 1 second to 99 hours 
5. Negative pressure indication; pointer. 
6. Control Box Functions: Controls the box body, power supply, indicator lights, start, stop, and overcurrent protection. 
III. Structure of the Watertightness Tester： 
Do not use sealed grease. The upper and lower parts are sealed by high-quality silicone rubber O-rings. The top of the container is a flat protective ring, which is convenient for holding. When a threaded plug is installed on the top for sealing, it cooperates with the circular protrusion at the bottom, allowing for stable stacking of multiple layers. 
IV. Advantages of the Watertightness Tester：
This testing machine is suitable for various electrical appliance water-tightness tests. It has a sophisticated mechanism, provides clear test results, is easy to operate and has excellent stability. 
V. Operating Procedures for Water Tightness Tester：
1. First, connect the air source, turn on the machine, and set the required test values. 
2. The machinery is undergoing testing. 
3. After the test is completed, read the test results directly. 
VI. Notes for the Watertightness Testing Instrument：
1.Before conducting the test, please make sure that the power supply is properly plugged in or connected. 
2. Before conducting the test, make sure that the product is properly installed and fixed. 
3. The mechanical transmission parts must be maintained regularly. 
4. After the test is completed, it is necessary to ensure that the power supply has been turned off. 
5. It is strictly prohibited to use auxiliary corrosive liquids to clean the machine. Instead, rust preventive oil must be used. 
6. This testing machine must be used exclusively by one person. During the testing process, it is strictly prohibited to strike the machine or have anyone stand near it. 
7. The machinery must be grounded.