[Inspector Encyclopedia] Introduction to watch inspection methods and providing professional inspection, factory inspection, certification and audit services

1. Overview: The importance of watch inspection

High-end watches are not only precise timekeeping instruments but also luxury goods that symbolize taste and status. Products from renowned brands like Patek Philippe, Breguet, and IWC command significant price tags, necessitating strict standards and professional inspection procedures during the inspection process. This article details the specific methods and precautions for watch inspection, providing practical guidance for inspectors, quality control personnel, and related professionals.

2. Preparation before inspection

Before starting the actual inspection, the following preparations need to be done:

• Review product specifications, acceptance criteria and quality requirements provided by customers

• Prepare complete inspection tools and equipment (multimeter, waterproof tester, caliper, magnifying glass, etc.)

• Determine the sampling plan (usually using AQL standards)

• Familiar with product process standards and customer special requirements

3. Packaging Inspection

1. Outer box/inner box inspection

• Check whether the material, thickness and strength of the outer box meet the transportation requirements

• Verify whether the mark information is correct, clear and complete

• Check the packaging for deformation, damage or contamination

2. Color box/blister packaging inspection

• Check whether the quality of packaging materials and design meet the requirements

• Verify whether the printed content of the color box is consistent with the product

• Check whether the internal cushioning material provides adequate protection

3. Accessory inspection

• Check whether the type and quantity of accessories are consistent with the list

• Check whether the quality of accessories meets the standard requirements

4. Document inspection

• Check whether the contents of the instruction manual, warranty card, service card, etc. are correct

• Verify the printing quality and binding process of document materials

• Confirm the consistency of content in multiple languages

4. Safety performance inspection

1. Edge and cusp inspection

• Use professional testing tools to check the case, strap and other parts

• Make sure there are no sharp edges and points to prevent injuries during use

• Pay special attention to the safety of the strap connection and crown

5. Appearance quality inspection

1. Product conformity confirmation

• Compare the sample provided by the customer with the standard sample

• Check the consistency between the product and the order requirements, color box pictures and instructions

• Verify the accuracy of key information such as brand identification and model identification

2. Appearance defect inspection

• Inspect watch cases, crystals, dials and straps under standard light sources

• Check for surface defects such as scratches, dents, stains, etc.

• Use a magnifying glass to check for minor flaws and processing marks

6. Mechanical properties test

1. Check for abnormal noise and looseness

• Check for foreign matter or loose assembly by manually tapping

• Listen to whether the movement sound is normal and even.

2. Assembly quality inspection

• Check whether the assembly gaps of each component are uniform and meet the standards

• Verify that the tightness of the accessories is appropriate

• Check the fit between the strap and the case

3. Battery installation check (if applicable)

• Check whether the battery is installed correctly and firmly

• Verify the functional effectiveness of the electrical insulation protection film

• Test product stability after battery door is closed

7. Functional performance test

1. Time accuracy test

• Use a professional calibrator to check the time accuracy

• The standard is usually ±1 second/day (higher requirements for high-end watches)

• Record 24-hour travel time error data

2. Check the pointer alignment accuracy

• Check the accuracy of the minute hand's pointing when the hour hand is at the top of the hour

• Verify the accuracy and timeliness of calendar jumps

3. Continuous running time test

• Perform a real-time test for at least 24 hours

• Ensure that there is no stopping or pointer stagnation.

4. Functional operation test

• Test the operability of all functions according to the instructions

• Check the accuracy of settings for time, calendar, alarm, etc.

• Verify that special functions (such as moon phase, chronograph, etc.) are working properly

8. Professional Test Items

1. Electrical performance test

• Battery voltage measurement : Use a multimeter to check the battery voltage, which should be greater than 1.50V

• Working current test : Connect the multimeter in series to the power supply circuit, measure the working current and record the parameters

2. Waterproof performance test (applicable watches)

• Select appropriate test method and air pressure standard according to customer requirements

• Real water testing method :
  a. Immerse the meter completely in water and apply the required air pressure.
  b. Take it out and place it on a heating plate to heat it to the appropriate temperature
  c. Drop cold water on the watch glass to reduce its temperature suddenly
  d. After wiping dry, check if there is any condensation inside the watch glass.

3. Durability test

• Bare phone drop test : dropped from 1 meter height onto a hardwood board in 3 different directions

• Check if the product is damaged after falling, if the pointer is off, and if the watch glass is cracked.

4. Check battery expiration date

• Verify that the battery is valid for 6 months (or as per customer's requirements)

5. Strap strength test

• Use a tensile testing machine or test the strap strength manually

• Check if the strap is cracked or deformed after testing

6. Surface treatment inspection

• Conduct electroplating thickness test if required by customers

• Check the quality of surface treatments such as PVD coating and polishing

7. Internal process inspection

• Check whether the movement model and brand are consistent with the requirements

• Verify that batteries and other critical components meet specifications

9. Dimension and marking inspection

1. Barcode scanning inspection

• Scan the barcode 3 times with a scanner to ensure readability

• Verify that scanned results are consistent with printed content

2. Package size and weight check

• Measure the outer dimensions and gross weight of the shipping carton

• Compare with product specifications

3. Product size measurement

• Measure key dimensions of watch cases, watch straps, etc.

• Use precision calipers to ensure measurement accuracy

10. Transport simulation test

1. Shipping carton drop test

• Transport simulation test according to customer requirements

• Record test results and make recommendations for packaging improvements

11. Inspection Report and Records

• Detailed records of all inspection data and results

• Take photos and describe the non-conforming items in detail

• Issue professional inspection reports and make improvement suggestions

• Keep inspection records for traceability and factory audit

12. Summary

Watch inspection is a systematic and meticulous process, requiring inspectors to possess specialized knowledge and extensive experience. Through rigorous inspection procedures and professional testing methods, we can ensure that watch product quality and performance meet regulatory requirements, safeguarding brand reputation and consumer rights. Inspectors are advised to continuously accumulate experience and promptly update inspection standards to enhance the professionalism and effectiveness of their inspection work.