QC Department

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


Quality inspection equipment—2.5D Contactless image measuring machine+-0.001mm offers position size, angle, diameter, depth, aperture or tiny works among others.

Quality inspection equipment—Quality control limit sample room—Quality control related samples (limit samples, test patterns, real accessories, production confirmation, first confirmation sample).

Quality inspection equipment—Plastic material analyzer—gravimeter+-0.001 for analyzing specific gravity and comparing plastic materials

Quality inspection equipment—Flatness measuring instrument of low force—12.5mm+-0.01mm- for single leveling

Quality inspection equipment—Trinocular stereo microscope 7X-45X—upper light source, used to check and compare appearances, and detailed forming situation of plastic products

Quality inspection equipment—binocular stereo microscope 20X-40X—bottom light source, used to check and compare detailed forming condition except those of transparent or translucent products

Quality inspection equipment— Height gauge+-0.01mm, single height measurement, without any personal errors.

Quality inspection equipment—depth gauge 0-25mm+-0.01mm, single depth measurement, without any personal errors

Quality inspection equipment—block gauge, to measure more precise sizes of single inner diameters

Quality inspection equipment — Hardness tester SHORE-A, hardness to be the same as that of TPE/thermoplastic elastomer, as per customers requirements

Quality inspection equipment- light source magnifier, to check and compare appearance of plastic products

Quality inspection equipment-PANTONE, Color cards (glossy+matte), to check and compare colors of plastics.

Quality inspection equipment—aheight gauge, quality inspection equipment—tensile test machine

Quality document- quality announcement area/ exclusive cargo elevator

Production quality—interval analysis/bad control—production stability

Production quality-speed and pressure flow analysis

Production quality—injection production abnormality treatment

Production quality—first article assurance

Quality document—quality specification (single part)

Quality document—product documentation


Quality Inspection Equipment—West German Precise Plug Gauge/Precise Block Gauge

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)

Quality Abnormal Analysis—Plastic Injection Parts


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