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Sight glass Product List and Ranking from 22 Manufacturers, Suppliers and Companies

Last Updated： Aggregation Period:Nov 05, 2025～Dec 02, 2025
This ranking is based on the number of page views on our site.

Sight glass Manufacturer, Suppliers and Company Rankings

Last Updated： Aggregation Period:Nov 05, 2025～Dec 02, 2025
This ranking is based on the number of page views on our site.

  1. サワダ製作所 Hyogo//Other manufacturing
  2. BBKテクノロジーズ ​計装部門 Tokyo//Testing, Analysis and Measurement
  3. 日本クリンゲージ 東京営業所 Tokyo//Industrial Machinery
  4. 4 MONOVATE(旧：日東金属工業) 八潮工場 Saitama//Industrial Machinery
  5. 4 三広アステック Tokyo//Industrial Machinery
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Sight glass Product ranking

Last Updated： Aggregation Period:Nov 05, 2025～Dec 02, 2025
This ranking is based on the number of page views on our site.

  1. Direct-reading liquid level gauge (glass liquid level gauge) BBKテクノロジーズ ​計装部門
  2. Round Glass Tube Water Level Gauge (Tubular Type) KGV-N Model サワダ製作所
  3. LED light-equipped sight glass with adjustable irradiation angle [NMB-LA] MONOVATE(旧：日東金属工業) 八潮工場
  4. 4 Reflective Liquid Level Gauge Model UZ サワダ製作所
  5. 4 Sanitary rule site glass [Site Cap (R)] ナガセ

Sight glass Product List

1～15 item / All 64 items

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Sight glass (peephole) SG

Sight glass (peephole) SG

A viewing window that can be directly attached to a helix mounted on the lid of a stainless steel container to observe the interior of the container.

〇It is a viewing window that is directly attached to the helix mounted on the container lid for internal observation of the container. 〇It is easy to attach and detach for helix connection, and can be disassembled for cleaning. 〇The window frame is made of SUS304 (option: SUS316L). 〇Please choose the window glass from Tempax, Tempax reinforced, or ordinary reinforced glass.

  • 12_01_sg_2.jpg
  • Stainless steel container

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Reflective liquid level gauge (water level gauge)

Reflective liquid level gauge (water level gauge)

Armored type glass reflective liquid level gauge (water level gauge)

Direct measurement of the liquid level with glass allows for reliable liquid level management. We can manufacture the installation length and shape (flange, threaded, etc.) according to your specifications.

  • Electrical Instruments/Electrometers
  • Instrumentation and Control Systems
  • Piping Materials

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Glass - Metal Ring Fusion Site Glass Clean Port

Glass - Metal Ring Fusion Site Glass Clean Port

Screw-in type sight glass

The glass is reinforced through a unique fusion technology of metal frames and glass. Unlike regular tempered glass, it can be used as a safer sight glass.

  • Other process controls
  • Other machine elements
  • Piping Materials

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Tubular liquid level gauge

Tubular liquid level gauge

Glass tube type tubular level gauge

With 50 years of experience, Nihon Clingage Co., Ltd. provides highly reliable products through our liquid level gauge technology. We can deliver standard products within 1 to 2 weeks.

  • Electrical Instruments/Electrometers
  • Instrumentation and Control Systems
  • Piping Materials

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Welded type observation window round welded type sight glass

Welded type observation window round welded type sight glass

Welded type sight window, round welded type sight glass.

With 50 years of experience, Nihon Clingage Co., Ltd. offers highly safe sight glasses thanks to our glass level gauge sealing technology. We can accommodate your requested sizes, materials, and more. Compliance with various regulations is possible. Please contact us for inquiries.

  • Electrical Instruments/Electrometers
  • Instrumentation and Control Systems
  • Other machine elements

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Metal Fusion Sight Glass Clinport(R)

Metal Fusion Sight Glass Clinport(R)

Glass and metal are integrated, giving it an astonishing strength as a glass product.

The metal-fused sight glass, Clinport(R), is a product born from a revolutionary technology that powerfully and hermetically fuses special glass directly to the inner wall of a metal ring, while utilizing the difference in thermal expansion coefficients between the metal ring and the glass to enhance the glass. It has obtained patents in Japan and the United States, proving the uniqueness and excellence of its technology. Since the glass and metal are integrated, it possesses an astonishing strength for a glass product. Therefore, there is almost no concern about glass breakage. If the glass does break, the damage remains confined to the surface layer, appearing in thin, flake-like pieces, and the destruction progresses gradually, which prevents the contents from spilling out in the event of a breakage, thus earning high safety ratings. For more details, please contact us or refer to the catalog.

  • Glassware and containers
  • Glass

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Transparent Water Surface Gauge (High Pressure Type)

Transparent Water Surface Gauge (High Pressure Type)

High-pressure water level gauge! Numerous applications in marine main boilers and thermal power plant turbine systems.

The "Transparent Water Level Gauge (High Pressure Type)" is a top-grade water level gauge. It is highly rated for its stable performance and is widely used as a water level gauge for high-pressure water supply heaters, primarily in main boilers for ships and turbine systems for thermal power generation. By securing two gauge glasses with front and rear covers, the gauge glasses are not subjected to clamping force, resulting in a structure that reduces stress and is less prone to damage even under high temperature and high pressure. 【Features】 ■ Uses a special graphite packing as a sealing gasket to prevent damage and leakage of the gauge glass. ■ Equipped with a mica plate (muscovite) on the inside to protect the gauge glass from corrosion. ■ The visible direction of the water level gauge can be freely adjusted. ■ Utilizes energy-efficient LED lighting to prevent bulb failure due to ship vibrations. *For more details, please refer to the PDF materials or feel free to contact us.

  • Other measurement, recording and measuring instruments

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Reflective Liquid Level Gauge Model UZ

Reflective Liquid Level Gauge Model UZ

A versatile model with high airtightness and safety! The visible direction of the liquid level gauge can also be freely adjusted!

The "UZ Type Reflective Liquid Level Gauge" is a highly versatile liquid level gauge commonly used in low-pressure tanks and low-pressure boilers. By tightening the center piece with U-bolts, it can maintain a high level of sealing, ensuring high safety. 【Features】 ■ The grooves on the liquid contact surface of the gauge glass create a prism effect, making the liquid part appear black and the gas part appear white. ■ It can be connected to accommodate longer visible sections. ■ The visible direction can be freely adjusted. ■ Material selection can be tailored to usage conditions and environments. ■ Compliant with the High-Pressure Gas Safety Act (regulations). *For more details, please refer to the PDF document or feel free to contact us.

  • Other measurement, recording and measuring instruments

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Transparent liquid level gauge

Transparent liquid level gauge

A user-friendly, versatile level gauge! Flexibly meets a wide range of needs!

The "Transparent Liquid Level Gauge" is a structure that allows direct observation of the liquid level through two gauge glasses sandwiching a center piece. It is a general-purpose type that can be used in conjunction with a water level gauge, and while the water level gauge for boilers uses mica plates, the liquid level gauge typically does not. Additionally, using energy-efficient LED lighting instead of a light bulb makes the entire visible area a more vibrant green, and the waterline shines white and becomes clearer. 【Features】 ■ Can be connected to accommodate long visible sections ■ Visible direction can be freely adjusted ■ Material selection can be tailored to usage conditions and environments ■ Compliant with high-pressure gas safety regulations (legal requirements) *For more details, please refer to the PDF document or feel free to contact us.

  • Other measurement, recording and measuring instruments

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Welded liquid level gauge

Welded liquid level gauge

Direct monitoring of the inside of tanks and containers! High reliability against liquid and fluid leaks!

The "Welded Liquid Level Gauge" is a liquid level gauge that can directly monitor the interior of tanks and containers, and is welded to various tanks and pressure vessels. Additionally, due to its structure, the packing connection points are only at the gauge glass section, making it a highly reliable liquid level gauge against liquid or fluid leaks. 【Features】 ■ Direct monitoring of liquid and fluid levels in the tank without time delay ■ Extremely high reliability and safety against liquid and fluid leaks ■ Compatible with solidifying liquids and high-viscosity fluids ■ Easy cleaning with flange connection ■ Wide visibility allows for monitoring inside the tank and can also be used for light transmission ■ Contact surfaces can be processed to R shape to match the installation area *For more details, please refer to the PDF document or feel free to contact us.

  • Other measurement, recording and measuring instruments

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Rust-resistant LED light-equipped sight glass [NMB-LC]

Rust-resistant LED light-equipped sight glass [NMB-LC]

A stainless steel peephole that prevents the glass from falling out when removed from the door, now made even easier to see with a flashlight.

- By attaching it to the container's rules, you can check the internal condition of the container. - A low-heat, high-brightness LED light brightly illuminates the inside of the container. - The light is battery-operated and can be attached to the window, eliminating the need to carry it around or use a power cord. - It comes with a stainless steel case that protects the light from corrosive splashes and contents. - It is safe because the glass does not fall off when removing the window from the rules. - The liquid contact part is made of SUS316L, which has excellent corrosion resistance. - The inner surface is tapered to maximize the field of view.

  • NMB-LC_02-1.jpg
  • NMB-LC_03-1.jpg
  • NMB_04-1.jpg
  • Stainless steel utensils and containers

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Stainless steel sight glass with wiper for clear visibility [NMBW]

Stainless steel sight glass with wiper for clear visibility [NMBW]

A sight glass that prevents glass from falling off when removed from the heater. It comes with a wiper to ensure visibility even if the window fogs up due to steam or splatter from the contents.

- By attaching it to the container, you can check the internal condition of the container. - It is safe because the glass does not fall off when removing it from the container. - When you turn the handle, the inner wiper blade rotates, allowing you to wipe away dirt and water droplets. - The liquid contact part is made of SUS316L, which has excellent corrosion resistance. - The inner surface is tapered to maximize visibility.

  • NMBW_02-1.jpg
  • NMBW_03.jpg
  • NMB_04-1.jpg
  • Stainless steel utensils and containers

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Heuristic sight glass with protective cover [NM-P]

Heuristic sight glass with protective cover [NM-P]

A new lineup of peek windows that allow you to check the contents of the container has arrived! A protective cover attached to the window section prevents damage.

A protective cover has been added to the sight glass (viewing window) installed on the container's flange. A sliding cover is attached based on the viewing window [NM]. - By attaching it to the flange of containers, you can check the internal condition of the container. - It prevents the window from breaking when external impacts occur. It also prevents dust accumulation. - In the event that the window breaks due to pressure from inside the container, it prevents the shards from scattering.

  • NM-P_01.jpg
  • NM-P_04.jpg
  • NM-P_03-1.jpg
  • Stainless steel container

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【Installation method is flexible!】Pressure transmitter type liquid level gauge P series

【Installation method is flexible!】Pressure transmitter type liquid level gauge P series

Robustness type commonly used in applications with high humidity and significant vibrations, such as ships, due to factors like vibration, seawater resistance, high temperature and humidity, and intense liquid agitation.

The liquid pressure in the tank is detected by a diaphragm, and the capacitance changes as the distance between the two electrodes arranged in parallel inside changes. An analog signal of 4-20 mA is also output from the center, transmitting and displaying the liquid level in the tank to monitoring panels, etc. It is possible to provide not only the sensor but also a system that includes a display unit. <Features> ■ Compact size and robust structure make installation and maintenance easy. ■ The sensor part is protected, making the diaphragm less prone to damage. ■ Various mounting methods are available, allowing for adaptation to different installation environments. *For more details, please refer to the PDF materials or feel free to contact us.

  • Other electronic parts
  • transformer

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FCD-made ball-type sight glass

FCD-made ball-type sight glass

Visually confirm the flow inside the piping with the movement of the ball.

The sight glass is used as a device to visually confirm the flow of fluid from outside the piping.

  • Piping Materials

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