can it be used permanently ? connect it to the main water system of the house to measure regularly?

Yes it can be used permanently attached to a 3/4 hose faucet you dont intend to use , like a washer port or outside type hose faucet valve . I have these attached to the clean out/Flush out on cold water input supply side of a tank less water heater (I just leave the ball valve open instead of having port closed/capped.This allows you to get water pressure reading after water filters and have a diagnostic water pressure gauge if you should have problems with your tank less water heater issues of flow/pressure input.

Where are instructions? What is the significance of the red pointer vs. the black pointer and how long is the testing period?

No instructions. Just connect it to a spigot and turn the spigot on. The black needle will indicate the current pressure. Set the red pointer to where the black pointer is. The red will stay put to let you know if there has been a change in pressure. Example: turn on water, black needle goes to 70 psi. Set the red needle to where the black needle is. Perform any tests (i.e. turn off the water at the main valve from the meter with the spigot still in the on position). Check the gauge. Any movement indicates a leak in the system. The red gauge is your benchmark setting now. I used it to detect leaks in my water system. My meter is about 1/4 mile from the house. My wife could give me readings over the phone while I made adjustments upstream of the house.

Gauage filled with water, is this defective?

Yes. The gauge is not supposed to fill up with water. Mine remained dry after connecting to the line.

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2-1/2" Water Pressure Test Gauge, 0-200 PSI, Red Max Pointer, 3/4" Female Hose Thread, Rust-Free Corrosion-Resistant Case, Brass Connector, for Home, Garden, RV, Indoor/Outdoor

2-1/2" Water Pressure Test Gauge, 0-200 PSI, Red Max Pointer, 3/4" Female Hose Thread, Rust-Free Corrosion-Resistant Case, Brass Connector, for Home, Garden, RV, Indoor/Outdoor

Product ID: 120010836

Details

Brand
CARBO
Item Weight
5 ounces
Item dimensions L x W x H
3.9 x 2.4 x
Material
Copper Alloy
Number of Items
1

📏0-200 PSI dual-scale precision

🔧Universal 3/4" female hose thread

🛡️Rust-free corrosion-resistant case

€ 23.04

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Gauge Your Pressure Like a Pro — Don’t Let Your System Surprise You!

PRECISION YOU CAN TRUST - ASME B40.1 Grade A accuracy ±2.5% ensures flawless pressure readings every time.
EFFORTLESS COMPATIBILITY - Standard 3/4" female hose thread fits garden hoses, faucets, and RV setups—no extra tools needed.
BUILT TO BRAVE THE ELEMENTS - Rust-proof plastic case and brass connector deliver leak-proof, weather-resistant durability indoors or outdoors.
INSTANT PEAK PRESSURE TRACKING - Red max pointer captures and holds pressure spikes so you never miss critical data.
CLEAR READINGS IN ANY CONDITION - Large 2.5" dial with bold PSI/Bar markings and anti-fog lens for easy monitoring, rain or shine.

The CARBO Instruments 2-1/2" Water Pressure Test Gauge offers precise 0-200 PSI dual-scale measurement with ±2.5% accuracy, featuring a rust-free corrosion-resistant case and brass connector. Its universal 3/4" female hose thread ensures seamless connection to garden hoses, faucets, or RV systems. Designed for durability and clarity, it includes a red max pointer for peak pressure tracking and a large anti-fog dial, making it the trusted choice for home, garden, and outdoor pressure monitoring.

Specifications

ASIN	B07PGXSWF5
Best Sellers Rank	#2,127 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Pressure Washer Gauges #4 in Industrial Pressure Gauges
Brand Name	CARBO INSTRUMENTS
Customer Reviews	4.4 4.4 out of 5 stars (4,432)
Included Components	Teflon, Rubber seal, Video Instruction
Item Dimensions	3.9 x 2.4 x 1.3 inches
Item Weight	5 ounces
Manufacturer	CARBO USA
Material Type	Copper Alloy Brass
Model	D25-P-W-200
Part Number	D25-P-W-200
Set Name	2.5 inches
Thread Style	Npt
UPC	810017351800
Unit Count	1 Count

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€ 23.04

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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