Quality Control Management System

Products-Quality management, incoming quality control—MIL-STD-105 Production line operator quality control, 100% inspection, Professional quality control personnel sampling, and out-going quality control—MIL-STD-105

Lon-So keeps strengthening production equipments, adopting most advanced machines, not only ensures product quality but also take care of tatal outputs, and which guarantee our punctual shipments, without ant delay in delivery. All production process from R&D of products through shipments is strictly controlled by experienced professional, in addition to the independent quality control room for best stable and quality products.

International Quality International Quality


Finished product size measurement

Production Quality Standard Table

Production Order

BOM table

Machine Production Resume


Internal Abnormality Prevention List

Shipping Abnormal Correction Prevention Order

Process Inspection Record

Shipment receipt

Sample Confirmation Form

We have various precise inspection instruments such as 2.5D coordinate measuring instrument, inner (and outer) diameter centimeter, outer diameter centimeter, electronic measuring platform standard block gauge, torque wrench, granite surface plate, cylinder gauge, plug gauge, hardness tester, and electronic vernier caliper among others that enanle us to meet the goal of monitoring quality and maintaining stability in operation.




Inspection room


Quality Inspection Equipment

  • Thermometer (+- 1 degree)
  • Hardness tester(A)
  • Vernier caliper (+-1um)
  • Level
  • Quality inspection record
  • Granite surface plate
  • Inner(and outer) diameter centimeter

Quality inspection equipment

  • Electronic Vernier caliper (+-1um(o.o1mm)
  • Mold thermometer +- 1 degree
  • Thickness gauge +-1um(0.01mm)
  • Cylinder gauge
  • Altimeter
  • Precision block gauge/plug gauge
  • Tensile test machine

Color Matching Equipment

  • gloss tester
  • color difference meter
  • Light source Box
  • standard color card
  • electronic weigher (+-0.2g)


Having been in the field for over 41 years, we meet requirements of customers offering quality products. OEM/ODM orders are more than welcome.

Please contact us directly for quality service as we are always pleased to do our best to help you