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CSC Co., Ltd. is a company specialized for helping customers from coarse particle problem in Cleanroom.

Dust Finder L3SQ (L-Three-Square)

Dust Finder L3SQ Dust Finder L3SQ can visualize any defects and dust on the surface very well. We can see the minimum size of dust in 10μm in the best conditions (e.g. in the dark surroundings, on flat surface, etc.)

Size (Light Part): 223㎜×30㎜×31㎜
Weight: 270g

Use applications

- Assembly of touch panels for smartphones and tablet terminals
- LCD assembly inspection
- Inspection of liquid crystal panel and plate glass
- Inspection confirmation of medical device parts
- Checking for foreign matter on the cut film
- Checking for foreign objects on the workbench
- Checking for foreign matter on resin molded products to be coated with spindle
- Foreign matter inspection before applying laminate film
- Cleaning of silicon wafer for coarse particle counter RACCAR
- Pre-print inspection of printed matter such as stickers
- Highly smooth metal plate (stainless steel, iron, aluminum, copper, etc.)
- Foreign matter adhesion inspection for Petri dishes, etc.

Brightness Adjuster

The brightness adjustment function allows you to adjust the light's brightness depending on the size of the particles you want to see.


Dim light to see only big size particles.

Bright light to see small size particles.


Green Filter
To make it easier to see particles.

Needed when setting green filter to the light without stand. To protect light from the gap between the light and the filter.

To adjust height and angle of the light.

Flexible Arm
To adust the light to the best angle to see the particles.

Visualize the dust clealier with Green Filter

Click the picture to enlarge.
You can see that L3SQ "With Green Filter" visualizes the dusts clearer than "Without Green Filter".

Dust Finder L3SQ vs LED Stand Lamp

Acrylic Board (White)


LED Stand Lamp

Acrylic Board (Black)


LED Stand Lamp

Clear Board


LED Stand Lamp

Aluminium Plate


LED Stand Lamp

Silicon Wafer


LED Stand Lamp

Dust Finder L3SQ can visualize dust more efficiently than normally-used LED Stand. Moreover, we counted the dust on silicon wafer by [RACCAR : Coarse Particle Counter] and found that Dust Finder L3SQ can visualize even the particle smaller than 30μm (RACCAR can count the smallest particle at 30μm)




 Product: Dust Finder L3SQ (L-Three-Square)
 Light Source: LED
 Maximum Output: 15W
 Power Source: AC Adapter
 Input Voltage (Light Unit): DC12V
 Input Voltage (AC Adapter): 100- 240V, 50/60Hz

Compare with the other Clean Room Light
Cleanroom Light Mini
Lightweight and easy-to-carry LED light
For checking dust in a small area.
Cleanroom Light NP-1
3,400 lumens strong HID light!!
For checking dust over a wide area or large workpieces.
To see dust in the air.
Dust Finder L3SQ
LED bar type light
For the inspection process.

CSC Co.,Ltd.
E-mail :
TEL: (+81)78-252-7201