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Item #:
145459906
Mark II 25 Liquid Filled Manometer, 3" wc, 3% Accuracy for Pressure Testing | Ideal for furnace, duct, filter and gas pressure checks. Compatible
76% of respondents would recommend this to a friend
Item #:
145459906
TTD 368
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
25%
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In stock
Imported from USA store
QTY:
Only 10 items left in stock.
Order now and get it around Wednesday, September 23
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Precise measurement and durable design make the Mark II 25 Liquid Filled Manometer the best choice for air velocity and filter performance applications.
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What Stands Out
High Accuracy
With a precision of 3% accuracy, the Mark II Manometer ensures reliable readings, making it an ideal choice for HVAC professionals seeking dependable performance in critical applications.
User-Friendly Design
The wall mount design offers easy installation and clear visibility, allowing for quick assessments in any setting, thus enhancing convenience for technicians during maintenance or monitoring tasks.
Fluid Compatibility
The red oil fluid not only enhances visibility but also ensures resistance to environmental factors, providing durability and effective operation, particularly useful in dynamic industrial environments.
Product Details
| Brand Name | FUHUOLU |
| Number of Items | 1 |
| Part Number | Mark II 25 |
| UPC | 601236839985 |
| Manufacturer | FUHUOLU |
| Included Components | 1 |
| Material Type | Metal |
| Item Dimensions | 5 x 3 x 4 inches (12.7 x 7.6 x 10.2 cm) |
| Item Weight | 16 ounces (453.6 grams) |
| Brand | FUHUOLU |
| Material | Metal |
| Item dimensions L x W x H | 5 x 3 x 4 inches (12.7 x 7.6 x 10.2 cm) |
Who Should Buy?
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HVAC Technicians
Ideal for HVAC professionals needing accurate pressure measurements for system diagnostics and adjustments.
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Home Inspectors
Useful for home inspectors evaluating HVAC systems and ensuring they operate within optimal pressure ranges.
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General Contractors
Beneficial for contractors overseeing installation or maintenance of gas and air systems requiring pressure assessment.
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Precision Labs
Not suitable for laboratories needing highly precise instruments beyond the 3% accuracy specification.
Product Description
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Customer Questions & Answers
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Question:
What is the purpose of the Mark II 25 Liquid Filled Manometer?
Answer: The Mark II 25 Liquid Filled Manometer is designed to precisely measure gas pressure and air flow in heating, ventilation, and air conditioning (HVAC) systems. Its liquid-filled design dampens vibrations for accurate readings, making it especially useful in industrial settings. For instance, HVAC technicians can use it to monitor pressure in ductwork, ensuring systems are operating efficiently. -
Question:
How do I calibrate the Mark II 25 Liquid Filled Manometer?
Answer: Calibrating the Mark II 25 involves ensuring that the gauge reads zero when no pressure is applied. Typically, this means adjusting the zero point using the calibration screw located on the device. It's crucial to perform this calibration before first use or after any significant temperature changes to ensure accuracy, especially during critical applications in HVAC systems. -
Question:
What are the benefits of using a liquid-filled manometer over other types?
Answer: Liquid-filled manometers, like the Mark II 25, offer enhanced stability and less sensitivity to vibrations compared to traditional analog or digital gauges. The liquid creates a damping effect which helps maintain accurate readings in fluctuating environments. This makes them ideal in demanding applications where precise measurements are critical, such as in laboratory or industrial applications. -
Question:
Can the Mark II 25 be mounted on a wall?
Answer: Yes, the Mark II 25 is specifically designed for wall mounting, ensuring easy visibility and accessibility. Its wall-mount feature is perfect for workshop or service environments where technicians need to frequently monitor pressure levels. This promotes a more organized workspace, allowing for quick checks during system evaluations. -
Question:
What kind of fluid is used in the Mark II 25 manometer?
Answer: The Mark II 25 uses a red oil fluid, which is specifically chosen for its thermal stability and visibility. This red gauge fluid helps users quickly identify readings against the manometer scale. Such precision is particularly beneficial in high-pressure systems found in HVAC and pneumatic applications, ensuring accurate measurements under various conditions. -
Question:
What range of pressure can the Mark II 25 measure?
Answer: The Mark II 25 measures pressure in a range of 0-3 inches of water column (w.c.). This range is ideal for many low-pressure applications, particularly in HVAC systems. Users can confidently monitor pressures in gas lines or air ducts, ensuring that their systems operate within optimal parameters. -
Question:
Is the Mark II 25 suitable for outdoor use?
Answer: While the Mark II 25 is designed for reliable performance, its liquid-filled construction may not be ideal for extreme outdoor conditions. The gauge should preferably be used in an indoor environment or protected from harsh weather conditions to maintain its accuracy and integrity. For outdoor applications, a protective housing can help shield the manometer. -
Question:
What is the accuracy rating of the Mark II 25?
Answer: The Mark II 25 boasts an accuracy rating of 3%. This ensures that readings taken from the gauge are dependable for critical HVAC measurements and other applications. Users rely on its accuracy for adjustments and repairs, knowing that even slight deviations from optimal pressure can affect system performance. -
Question:
Can the Mark II 25 be used with non-Dwyer systems?
Answer: Yes, the Mark II 25 can be utilized with various systems beyond just Dwyer models. While it is compatible with Dwyer devices, its universal application makes it suitable for any system requiring low-pressure measurement. This versatility is particularly beneficial for technicians working with a range of different equipment. -
Question:
Where can I buy the Mark II 25 Liquid Filled Manometer?
Answer: You can purchase the Mark II 25 Liquid Filled Manometer through Ubuy in Trinidad and Tobago. Ubuy offers a reliable platform for obtaining this quality manometer, ensuring that you have access to tools that can enhance your HVAC diagnostics and performance monitoring.
FUHUOLU Manometers Editorial Review
**** The Mark II 25 Liquid Filled Manometer has garnered a mix of impressions from users, revealing a product valued for its solid Construction and straightforward functionality, yet hampered by issues surrounding its packaging and instructions. Many reviewers commended the manometer for its robustness and ease of use, appreciating its simplicity compared to electronic alternatives. Users noted that its mechanical nature means it doesn't fail in calibration, so long as gravitational forces remain Constant. This reliability is especially appreciated in applications such as airspeed indicator calibration and greenhouse insulation systems. However, feedback surrounding the product's packaging and user instructions has been a significant point of discussion. Some customers reported frustration due to fluid leakage during shipping and inadequate instructions, suggesting that a more detailed guide would enhance overall user experience. One user specifically mentioned the need for safety documentation regarding the fluid, highlighting a desire for transparency and clarity. Despite these drawbacks, the majority of users found the manometer to be effective for its intended purposes and highly reliable after installation. Overall, the Mark II 25 Liquid Filled Manometer is recommended for anyone seeking a dependable mechanical pressure gauge, provided they can navigate the initial setup hurdles. **
Customer Reviews & Ratings
9 customers ratings
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5 Star
45%
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4 Star
11%
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3 Star
7%
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2 Star
18%
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1 Star
19%
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Pros
- Solid and robust Construction
- Easy to use and read
- Simple installation process with complete manual
- Works well for various applications, including calibration
Cons
- Instructions deemed too brief and lacking detail
Platform Trust & Buyer Confidence
JK
Jasmin
Verified buyer
“Great products and very good service: very easy and very fast international delivery.”
9 September 2026 · via Trustpilot
AG
Anke
Verified buyer
“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”
10 September 2026 · via Trustpilot
H
Hazel
Verified buyer
“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”
10 September 2026 · via Trustpilot
O
Opaleye
Verified buyer
“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”
11 September 2026 · via Trustpilot
AC
Adele
Verified buyer
“Easy to find and order what you want on the website. Delivery is quick to the UK”
8 September 2026 · via Trustpilot
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Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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TTD 368
Order now and get it around Wednesday, September 23
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Only 10 items left in stock.
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Features & Benefits
- Achieves ±3% measurement accuracy in both positive and negative pressure.
- Inclined-vertical tube design offers a large measurement range and easy readability.
- Includes leakproof O-ring seals to minimize fluid loss and ensure reliability.
- Ideal for air velocity and filter performance monitoring, ensuring timely replacements.
- Red anti-freezing fluid allows for use in cold environments without evaporation issues.
- Comes complete with all necessary accessories for immediate installation and use.
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