---
product_id: 82094632
title: "Dwyer Series Mark II 25 Molded Plastic Manometer, Inclined-Vertical Scale, 0 to 3 inH2O Measuring Range, Red Gauge Fluid, 0.826 sp. gr."
brand: "dwyer"
price: "S$218"
currency: SGD
in_stock: true
reviews_count: 5
category: "Dwyer"
url: https://www.desertcart.sg/products/82094632-dwyer-series-mark-ii-25-molded-plastic-manometer-inclined-vertical
store_origin: SG
region: Singapore
---

# 0-3 inH2O precise range Freeze-proof red gauge fluid Leakproof O-ring seals Dwyer Series Mark II 25 Molded Plastic Manometer, Inclined-Vertical Scale, 0 to 3 inH2O Measuring Range, Red Gauge Fluid, 0.826 sp. gr.

**Brand:** dwyer
**Price:** S$218
**Availability:** ✅ In Stock

## Summary

> 📊 Elevate your airflow game with precision and durability!

## Quick Answers

- **What is this?** Dwyer Series Mark II 25 Molded Plastic Manometer, Inclined-Vertical Scale, 0 to 3 inH2O Measuring Range, Red Gauge Fluid, 0.826 sp. gr. by dwyer
- **How much does it cost?** S$218 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/82094632-dwyer-series-mark-ii-25-molded-plastic-manometer-inclined-vertical)

## Best For

- dwyer enthusiasts

## Why This Product

- Trusted dwyer brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Leak-Resistant Design:** O-ring seals and overflow tank minimize fluid loss, guaranteeing consistent, maintenance-free operation.
- • **Durable & Reliable Build:** Molded plastic case with shock-mounted glass vial ensures long-lasting, wear-resistant performance.
- • **Freeze-Proof Fluid Advantage:** Red gauge fluid resists evaporation and freezing, perfect for cold environments and extended use.
- • **Precision Pressure Monitoring:** Accurate ±3% readings within 0-3 inH2O range for critical HVAC and airflow insights.
- • **Effortless Installation & Leveling:** Mounts on any vertical surface with built-in spirit level for quick, hassle-free setup.

## Overview

The Dwyer Series Mark II 25 Manometer offers precise differential pressure measurement from 0 to 3 inH2O using freeze-proof red gauge fluid. Its rugged molded plastic housing, leakproof O-ring seals, and built-in leveling system make it ideal for HVAC, air velocity, and filter performance monitoring in professional and cold environments. With ±3% accuracy and easy vertical mounting, it delivers reliable, maintenance-free readings for critical airflow management.

## Description

The Dwyer Mark II 25 inclined differential manometer with red gauge fluid has a 0 to 3 inH2O measuring range, built in zero level and molded plastic case for monitoring air velocity and air filter performance, and taking pressure measurements above and below atmospheric pressure. Red gauge fluid is freeze-proof and has lower evaporation rate for use in cold environments, and produces expanded scale viewing for improved reading resolution. The built-in zero level provides linear calibration. The manometer has a styrene-acrylonitrile housing, indicating tube, and fluid wells for strength and durability. The molded ABS knobs and zero adjust plunger and shock-mounted glass level vial are wear-resistant. Leakproof O-ring seals and overflow tank reduce the risk of fluid loss. Scales are lithograph printed on aluminum to ease reading, and are epoxy coated to protect against wear. The manometer can be mounted on any vertical surface. SpecificationsPressure typesSingle and differentialMedia typeAirCase materialStyrene-acrylonitrileMeasuring range0 to 3 inH2OFluid typeRed gauge fluid, 0.826 sp. gr.MountStand and vertical mountAccuracy+ or - 3% full scaleMaximum pressure10 psi/70 kPaMaximum temperature140 degrees F/60 degrees CWeight1.04 lbs./472gDimensions5-29/32 x 7-13/32 x 2-1/4 inches (H x W x D)H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.Manometers measure the pressure of a liquid or gas. They are used in laboratory, medical equipment, engineering, automotive, and heating, ventilation, and air-conditioning applications. Manometers measure any combination of gauge, absolute, or differential pressures. Gauge pressure is the amount of pressure in a system relative to the ambient pressure, absolute pressure is the amount of pressure in a system relative to an absolute vacuum, and differential pressure is the difference between two pressures. Analog manometers are composed of columns of liquid, and they use gravity and the liquid's density to calculate pressure. Because they have no moving parts, analog manometers do not require re-calibration. Digital manometers have pressure sensors that are connected to a system with a hose to provide a digital readout of the amount of pressure present in a system. They use microprocessors to calculate pressure, and they require periodic calibration to help ensure accuracy.Dwyer Instruments manufactures measurement and control instruments, including pressure gauges, flow meters, level instrumentation, temperature instrumentation, and air quality monitors. The company, founded in 1931, is headquartered in Michigan City, IN. What's in the Box?Mark II 25 manometerRed gauge fluid, 1oz.Flexible double column plastic tubing, 8 ft.(2) Tubing connectors, 1/8"(2) Mounting screwsRed and green pointer flagsInstructions

Review: Great for monitoring air flow. - I have used Dwyer products for many years and have always been satisfied with their accuracy and quality. I'm using this manometer to monitor the air pressure drop over my premium in-line electronic air filter. The manufacturer of the air filter says it could go for up to nine months before servicing, but I never expected that kind of performance. The Dwyer manometer proves that my filter, in my application, must be serviced within 40 days or the system airflow becomes too restricted leading to excessive energy consumption. I'd rather clean the filter more often than pay extra for fuel and electricity. Looks great too! Comes with mounting screws, red indicating fluid, and tubing. You'll need to buy a pair of magnetic static tips to insert into your ductwork.
Review: 3 years so far measuring the draft on my coal stove. A+++ - I bought this to measure the draft of my coal furnace. it functions perfect. Easy to install with great instructions. came with extra liquid in case you need to transfer it or whatever. this is three years now and works as good as the day i installed it. came with everything you need. including the fittings.

## Features

- May be fatal if swallowed and enters airways.
- May cause cancer.
- Inclined-vertical manometer for use in air velocity and air filter performance applications, and other general purpose applications
- Red gauge fluid is freeze-proof and has lower evaporation rate for use in cold environments, and produces expanded scale viewing for improved reading resolution
- 0 to 3 inH2O measuring with built-in zero level to ensure accurate readings
- Leakproof O-ring seals and overflow tank reduces risk of fluid loss
- Can be mounted on any vertical surface and built-in spirit level simplifies leveling

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Dwyer Instruments |
| Part number | 25 |
| Item Weight | 295 g |
| Product Dimensions | 19.05 x 3.18 x 15.24 cm; 294.84 g |
| Item model number | 25 |
| Size | 0-3"WC, Red oil, 0.826 sp. gr. |
| Material | Glass, Plastic, Acrylonitrile Butadiene Styrene |
| Item Package Quantity | 1 |
| Number of Pieces | 1 |
| Measurement Accuracy | +/-3% |
| Batteries included? | No |
| Batteries Required? | No |

## Images

![Dwyer Series Mark II 25 Molded Plastic Manometer, Inclined-Vertical Scale, 0 to 3 inH2O Measuring Range, Red Gauge Fluid, 0.826 sp. gr. - Image 1](https://m.media-amazon.com/images/I/61IMLzTTDNS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great for monitoring air flow.
*by G***4 on 25 March 2017*

I have used Dwyer products for many years and have always been satisfied with their accuracy and quality. I'm using this manometer to monitor the air pressure drop over my premium in-line electronic air filter. The manufacturer of the air filter says it could go for up to nine months before servicing, but I never expected that kind of performance. The Dwyer manometer proves that my filter, in my application, must be serviced within 40 days or the system airflow becomes too restricted leading to excessive energy consumption. I'd rather clean the filter more often than pay extra for fuel and electricity. Looks great too! Comes with mounting screws, red indicating fluid, and tubing. You'll need to buy a pair of magnetic static tips to insert into your ductwork.

### ⭐⭐⭐⭐⭐ 3 years so far measuring the draft on my coal stove. A+++
*by 9***N on 15 October 2025*

I bought this to measure the draft of my coal furnace. it functions perfect. Easy to install with great instructions. came with extra liquid in case you need to transfer it or whatever. this is three years now and works as good as the day i installed it. came with everything you need. including the fittings.

### ⭐⭐⭐⭐⭐ $60 and 20 minutes saves a lot of expensive filters
*by D***M on 16 January 2024*

With increasing combinations of heat and smoke in our area, we upgraded our air handler to accomodate a MERV16 4" filter. The filters are about $100 each and the default suggested lifespan is one year. It needed about 20 mintues to install this manometer and discover that at one year of age our filter was causing pressure drop far below the rating of our air handler. Given that interception by filters improves as they choke, the filter is doing fine. A six month extension of filter life in our case pays for half the cost of this device. Photo indicates simplicity of installation. Two holes in ductwork for tubing port attachment, double-sided tape to mount manometer. Note that the area marked "filter" on the air handler is superseded by the larger filter housing at right (it's important to make sure manometer tubing is correctly installed on upstream downstream sides of filter).

## Frequently Bought Together

- Dwyer® Liquid Filled Wall Mount Manometer, Mark II 25, 0-3" w.c., 3% Accuracy
- Dwyer® Red Gage Fluid, A-101, 1 oz Bottle, .826 Specific Gravity
- Fieldpiece ASP2 Static Pressure Probes

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-10-10*