---
product_id: 6531689
title: "Supco DDM55 Dual Input Digital Differential Manometer with LCD Display, -55 to 55\" H20 Measuring Range, 0.01\" Resolution, Battery Operated"
brand: "supco"
price: "MX$8629"
currency: MXN
in_stock: true
reviews_count: 12
category: "Supco"
url: https://www.desertcart.mx/products/6531689-supco-ddm55-dual-input-digital-differential-manometer-with-lcd-display
store_origin: MX
region: Mexico
---

# Backlit LCD display ±0.3% accuracy Battery & DC powered Supco DDM55 Dual Input Digital Differential Manometer with LCD Display, -55 to 55" H20 Measuring Range, 0.01" Resolution, Battery Operated

**Brand:** supco
**Price:** MX$8629
**Availability:** ✅ In Stock

## Summary

> 📊 Elevate your pressure game—precision meets portability in one sleek package!

## Quick Answers

- **What is this?** Supco DDM55 Dual Input Digital Differential Manometer with LCD Display, -55 to 55" H20 Measuring Range, 0.01" Resolution, Battery Operated by supco
- **How much does it cost?** MX$8629 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/6531689-supco-ddm55-dual-input-digital-differential-manometer-with-lcd-display)

## Best For

- supco enthusiasts

## Why This Product

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

## Key Features

- • **Versatile Power Options:** Stay powered on the go or at the bench with flexible 9V battery or external DC power—freedom to work anywhere.
- • **Crystal Clear Visibility:** Backlit LCD ensures flawless readability in any lighting condition, so you’re always in control.
- • **Precision Pressure Mastery:** Achieve ultra-accurate differential readings with ±0.3% full scale precision—never second guess your data again.
- • **All-in-One Pressure Toolkit:** Measure across 11 units including inH2O, psi, bar, and more—perfect for HVAC, gas systems, and leak detection pros.
- • **Portable & Ready for Action:** Lightweight design with flexible tubing and soft carrying case means you’re ready to troubleshoot anytime, anywhere.

## Overview

The Supco DDM55 is a portable digital differential manometer designed for precise low-pressure gas system measurements. Featuring a -55 to +55 inH2O range with ±0.3% accuracy, a backlit LCD for easy reading, and powered by a 9V battery or external DC, it’s ideal for HVAC professionals and engineers performing leak tests, regulator adjustments, and pressure switch verifications. Compact and versatile, it includes flexible tubing, fittings, and a carrying case for on-the-go diagnostics.

## Description

The Supco DDM55 digital manometer performs differential pressure measurements in low-pressure gas systems, including performing leak tests, setting delivery pressures, making regulator adjustments, and confirming pressure switch operation. The instrument has a -55 to +55 inH20 measuring range, + or - 0.3% full scale accuracy, and includes eleven units of measure including performing leak tests, setting delivery pressures, making regulator adjustments, and confirming pressure switch operation. The LCD has a backlight for viewing in a variety of lighting, and a data hold function to retain the last reading for recording. The manometer is powered by one 9V battery (included) or external 9V DC power, and includes flexible tubing, 1/8" MPT x 1/8" barb access fitting, and a soft carrying case. SpecificationsPressure typesDifferentialMedia compatibilityGasPressure range-55.0 to +55.0 inH20Accuracy+ or - 0.3% full scale accuracyResponse time0.5 seconds, typicalEngineering unitsInH20, ftH20, cmH20, psi, bar, mbar, kPa, inHg, mmHg, ozin2, Kgcm2Pressure limits10 psiDisplayDual LCDConnection1/8" MPT x 1/8" barbOperating temperature32 to 122 degrees F/0 to 50 degrees CPower requirements9V battery or external 9V DCManometers 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.Supco manufactures test instruments and replacement parts for heating, ventilation, air conditioning, and refrigeration systems. The company, founded in 1945, is headquartered in Allenwood, NJ. What's in the Box?Supco DDM55 differential manometerFlexible tubing1/8" MPT x 1/8" barb access fitting9V batterySoft carrying caseInstructions

Review: saved me a lot of troubleshooting - Used this for an airplane engine that was running high CHTs. Running these two air lines above and below the engine allowed me to work on getting the baffling way better and getting the low pressure on the bottom of the engine adequate to the point that our temperature problems are now solved! A good tool
Review: Great for the money - The unit is accurate and easy to use. The back light for the display is nice. Calibrating the unit is easy. For the money this is a great gauge.

## Features

- Portable differential manometer provides differential pressure measurements in low-pressure gas systems
- For use performing leak tests, setting delivery pressures, making regulator adjustments, and confirming pressure switch operation
- -55 to +55 inches H20 measuring range and + or - 0.3% full scale accuracy
- Units of measure include performing leak tests, setting delivery pressures, making regulator adjustments, and confirming pressure switch operation
- LCD with backlight and data hold provides access to measurements

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004OM8UCU |
| Best Sellers Rank | #506,933 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #121 in Manometers |
| Brand | Supco |
| Brand Name | Supco |
| Customer Reviews | 3.6 out of 5 stars 42 Reviews |
| Global Trade Identification Number | 00687152201433 |
| Included Components | Assembly Guide |
| Item Dimensions | 8.25 x 3 x 2 inches |
| Item Weight | 10.4 ounces |
| Item dimensions L x W x H | 8.25 x 3 x 2 inches |
| Manufacturer | Supco |
| Material | Polycarbonate (PC) |
| Material Type | Polycarbonate (PC) |
| Model | DDM55 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | DDM55 |
| Thread Style | 1/8" Mpt |
| Thread Type | 1/8" Mpt |
| UPC | 687152201433 787461660706 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Supco
- **Item Weight:** 0.65 Pounds
- **Item dimensions L x W x H:** 8.25 x 3 x 2 inches
- **Thread Type:** 1/8" Mpt
- **UPC:** 687152201433 787461660706

## Images

![Supco DDM55 Dual Input Digital Differential Manometer with LCD Display, -55 to 55" H20 Measuring Range, 0.01" Resolution, Battery Operated - Image 1](https://m.media-amazon.com/images/I/71VoGpq4-gL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ saved me a lot of troubleshooting
*by U***! on January 15, 2023*

Used this for an airplane engine that was running high CHTs. Running these two air lines above and below the engine allowed me to work on getting the baffling way better and getting the low pressure on the bottom of the engine adequate to the point that our temperature problems are now solved! A good tool

### ⭐⭐⭐⭐⭐ Great for the money
*by O***N on July 22, 2014*

The unit is accurate and easy to use. The back light for the display is nice. Calibrating the unit is easy. For the money this is a great gauge.

### ⭐⭐⭐ but the quality didn't seem much better than the ones on ebay for $40
*by S***. on November 14, 2014*

I'm sure it was accurate, but the quality didn't seem much better than the ones on ebay for $40. In fact it looked identical to those except for the brand label. While those aren't reasons to ding it, mine came through with the power button not seated properly, so it kept turning off and on. It had to go back.

## Frequently Bought Together

- Supco DDM55 Dual Input Digital Differential Manometer with LCD Display, -55 to 55" H20 Measuring Range, 0.01" Resolution, Battery Operated
- LiftMaster 850LM Universal Gate and Garage Door Opener Receiver

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-08-31*