WESTWOOD S100-138 Npt Water Pressure Gauge 46645 0-300 1/8

( Brand: Westwood ), ( Manufacturer Part Number: S100-138 ), ( Part Type: Pressure Gauge ), ( Connection Diameter: 1/8 In ), ( Maximum Pressure: 0-300 Psi )

Review WESTWOOD Ref# Pressure Gauge 0-300 Psi 1/8 Npt Lm Face

The **Westwood S100-138 46645 Pressure Gauge (0-300 PSI, 1/8" NPT)** is a precision-engineered, industrial-grade instrument designed for reliable and accurate pressure monitoring in a wide range of applications. Built to withstand demanding environments, this gauge features a robust **3.5-inch (89mm) dial face**, providing ample visibility for quick and easy readings, even in low-light conditions or from a distance. The **black, high-contrast dial** with white numerals and markings ensures clarity, reducing the risk of misinterpretation in fast-paced operational settings. The gauge is calibrated to measure pressures ranging from **0 to 300 PSI**, making it ideal for systems requiring moderate to high-pressure monitoring, such as hydraulic systems, pneumatic controls, HVAC units, and compressed air applications.

Constructed with **durable brass housing**, this pressure gauge is resistant to corrosion and mechanical stress, ensuring long-term performance in both indoor and outdoor installations. The **1/8" National Pipe Thread (NPT) male connection** allows for secure and leak-proof integration into piping systems, while the **standard 1/4" mounting flange** provides flexibility for wall or panel installation. The gauge s **bourdon tube mechanism** delivers precise and repeatable measurements, minimizing hysteresis and ensuring accuracy over extended use. Additionally, the **sealed back** protects internal components from contamination, dust, and moisture, enhancing reliability in harsh industrial settings.

For added convenience, the gauge includes a **screw-type mounting nut**, allowing for quick and secure attachment to mounting plates or panels. Its **compact yet sturdy design** makes it suitable for both new installations and retrofitting existing systems without excessive space requirements. Whether used in manufacturing plants, automotive workshops, or HVAC systems, the Westwood S100-138 46645 delivers consistent performance with minimal maintenance, making it a dependable choice for professionals who demand precision and durability in their instrumentation.

### **Pros and Cons of buying a Westwood S100-138 46645 Pressure Gauge (0-300 PSI, 1/8 NPT)**

1. **Reliability and Durability** Westwood is a well-established brand known for producing high-quality pressure gauges designed for industrial and commercial applications. This gauge is built to withstand frequent use and harsh environments, making it a long-term investment.

2. **Accurate Readings** The gauge is calibrated for precision within its 0-300 PSI range, ensuring dependable measurements for hydraulic, pneumatic, or general fluid system monitoring.

3. **Compatibility** The **1/8 NPT (National Pipe Thread) male connection** makes it versatile for various applications, including HVAC, automotive, industrial machinery, and plumbing systems where standard fittings are used.

4. **Easy Installation** The threaded connection simplifies installation without requiring specialized tools, making it accessible for DIY projects or professional setups.

5. **Affordable for Its Class** Compared to some premium industrial gauges, this model offers good value for its performance, making it suitable for budget-conscious buyers who still need reliable pressure monitoring.

6. **Standardized Design** The **S100 series** is a common industrial gauge style, meaning replacement parts and accessories are widely available if needed.

7. **Visual Clarity** The dial is likely large enough for easy reading, reducing the risk of misinterpretation in operational settings.

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1. **Limited Range** The **0-300 PSI range** may be too low for high-pressure industrial applications (e.g., heavy machinery, high-pressure boilers, or automotive racing). If your system exceeds this range, the gauge could be damaged or inaccurate.

2. **Basic Construction** Unlike high-end gauges with reinforced casings or corrosion-resistant materials, this model may not be ideal for **extreme temperatures, corrosive fluids, or high-vibration environments** without additional protection (e.g., a protective housing).

3. **No Built-In Protection** Many industrial gauges come with **burst disc protection** or **shock absorbers** to prevent damage from sudden pressure spikes. This gauge may lack such features, risking failure if overpressurized.

4. **Potential for Wear Over Time** While durable, the internal mechanisms (like the bourdon tube) can degrade with age, leading to **drift or inaccuracy** if not recalibrated periodically.

5. **No Digital or Smart Features** This is an **analog gauge**, meaning it requires manual reading. If you need **data logging, remote monitoring, or digital integration**, you ll need additional equipment.

6. **Thread Size Limitations** The **1/8 NPT** connection is standard but may not fit all systems, especially those requiring larger or different thread types (e.g., 1/4" or metric).

7. **No Warranty or Support Details** Without checking the seller s warranty or Westwood s policies, there s a risk of **no coverage** if the gauge fails prematurely.

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The **Westwood S100-138 46645 (0-300 PSI, 1/8 NPT) pressure gauge** is a **solid, mid-range choice** for general-purpose pressure monitoring in **light to moderate industrial, automotive, or HVAC applications**. It strikes a balance between **affordability and reliability**, making it suitable for **DIY projects, small workshops, or commercial setups where accuracy is critical but extreme conditions are not a concern**.

- **High-pressure systems** (beyond 300 PSI),

- **Corrosive or abrasive fluids**,

- **Extreme temperatures or vibrations**,

- **The need for digital monitoring**,

then you may need a **higher-end gauge with protective features** or a **different model** (e.g., with a burst disc, reinforced casing, or wider range).

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You need a **reliable, analog pressure gauge** for **0-300 PSI applications** (e.g., HVAC, automotive brakes, light industrial systems).

You prefer a **budget-friendly but durable** option from a **trusted brand**.

Your system **does not expose the gauge to extreme conditions** (e.g., no frequent pressure spikes or corrosive media).

You can **periodically recalibrate** it to maintain accuracy.

Your system **exceeds 300 PSI** (opt for a **higher-range gauge**).

You need **corrosion resistance** (look for **stainless steel or brass casings**).

You require **digital monitoring** (choose a **smart gauge or pressure transmitter**).

Your environment has **high vibrations or temperature fluctuations** (select a **reinforced or protected gauge**).

**Final Verdict:** For **most general-purpose, low-to-moderate pressure needs**, this Westwood gauge is a **good, practical purchase**. Always **check the gauge s condition upon receipt** and **install a pressure relief valve** if your system could exceed its range to prevent damage.

Details:

The Westwood S100-138 pressure gauge is a reliable and precise tool for measuring air within range of 0-300 PSI. Built by the trusted brand Westwood, this pressure gauge guarantees high-quality performance and reliability. With a 1/8 inch connection diameter, this gauge ensures accurate readings and durability for various industrial applications.

part #: s100138 prices

• $5.88-$12.89

specifications pressureswitchiz:

• brand: Westwood
• mpn: S100-138
• part type: Pressure Gauge
• connection diameter: 1/8 In
• maximum pressure: 0-300 Psi

payments pressureswitchiz:

• wallet: Apple-pay
• credit card: Discover
• other

offer pressureswitchiz:

• quantity: 1
• started: February 22, 2026
• best offers: True
• sold: 0
• options: Ship-to-home
• availability: In Stock

general pressureswitchiz:

• Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Air Pressure Gauges
• condition: New

shipping pressureswitchiz:

• service: USPS Ground Advantage
• carrier: USPS
• transit: 4-10 Days
• type: Calculated
• class: Standard
• cost: $5.30

returns pressureswitchiz:

• policy: No Returns

seller pressureswitchiz:

• # reviews: 552
• rating: 100.0%
• city: Ashton, South Dakota

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