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  3. METTLER TOLEDO ME-51

METTLER TOLEDO ME-51 Conductivity Standard Ms 12.88 Ms/cm X26

Me-51 Mettler Toledo Conductivity Standard 12.88 Ms/cm X26 New Old Stock Free Shipping

( Brand: Mettler Toledo ), ( Manufacturer Part Number: ME-51 ), ( Intended Use/discipline: Biological Laboratory )

Review METTLER TOLEDO Conductivity Standard 12.88 Ms/cm X26 New Old Stock Free Shipping

The **Mettler Toledo ME-51 Conductivity Standard (12.88 mS/cm, x26)** is a high-precision, traceable calibration solution meticulously designed for the accurate verification and maintenance of conductivity meters, pH meters, and other electrochemical measurement instruments. Engineered to meet the rigorous demands of laboratory and industrial applications, this conductivity standard provides a stable, reproducible reference point for ensuring measurement consistency across a wide range of analytical processes. With a nominal conductivity of **12.88 millisiemens per centimeter (mS/cm)**, this solution falls within the mid-range of common calibration standards, making it ideal for applications requiring moderate to high conductivity verification, such as in water treatment, pharmaceutical manufacturing, food and beverage processing, and environmental monitoring. The "x26" designation indicates that this standard is part of Mettler Toledo s **x26 series**, a collection of calibration solutions optimized for long-term stability, minimal drift, and compatibility with modern conductivity sensors. Formulated with ultra-pure, deionized water and carefully selected electrolytes, the solution is free from contaminants that could compromise measurement accuracy, ensuring reliable performance over extended periods. Each unit is rigorously tested and certified to meet international standards, including ISO 17025 and ASTM D1125, guaranteeing traceability to the International System of Units (SI). The ME-51 is packaged in a durable, low-evaporation container to preserve its integrity, while its clear labeling and sealed design minimize exposure to environmental factors that could alter its properties. Whether used for routine calibration checks, instrument validation, or quality control procedures, this conductivity standard delivers the precision and reliability required to maintain the highest standards of analytical integrity in any laboratory or production environment.

**Pros and Cons of buying a Mettler Toledo ME-51 Conductivity Standard (12.88 mS/cm, x26)**

### **Pros**

1. **Precision and Calibration Accuracy** Mettler Toledo is a well-established brand known for high-quality laboratory equipment. The ME-51 conductivity standard is designed to provide precise calibration for conductivity meters, ensuring accurate measurements in research, industrial, and quality control applications. Its certified value of 12.88 mS/cm (millisiemens per centimeter) makes it reliable for verifying sensor performance.

2. **Long-Term Stability** Conductivity standards are typically stable over time if stored properly. The ME-51, being a high-purity solution, is less prone to drift compared to DI water or less refined standards. This reduces the need for frequent recalibration, saving time and resources.

3. **Versatility in Applications** The 12.88 mS/cm value is a common reference point for checking the performance of conductivity sensors in various fields, including:

- **Water treatment** (e.g., verifying sensor response to brackish or moderately saline solutions).

- **Pharmaceutical and biotech industries** (where precise electrolyte measurements are critical).

- **Food and beverage testing** (e.g., monitoring salt content in processed foods).

- **Environmental monitoring** (e.g., checking sensor accuracy in wastewater analysis).

4. **Pre-Mixed and Ready to Use** The solution is pre-diluted and packaged in a sealed vial, eliminating the need for manual preparation. This reduces the risk of contamination and simplifies the calibration process.

5. **Compatibility with Mettler Toledo Sensors** Since this standard is part of Mettler Toledo s product line, it is optimized for use with their conductivity meters and probes, ensuring seamless integration and minimal compatibility issues.

6. **Traceability and Certification** The standard comes with a certificate of analysis, confirming its conductivity value with an associated uncertainty range. This traceability is essential for laboratories adhering to regulatory standards (e.g., ISO, FDA, or GLP compliance).

7. **Cost-Effective for Bulk Use** Purchasing the standard in a pack of two (x26) offers a slight discount per unit compared to buying single vials. This is beneficial for laboratories that perform frequent calibrations or have multiple sensors to verify.

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### **Cons**

1. **Limited Shelf Life** Conductivity standards, even high-purity ones, degrade over time due to evaporation, contamination, or chemical changes. While the ME-51 is stable for an extended period (typically 12 24 months when unopened and stored properly), its effectiveness diminishes after repeated use or improper storage. Laboratories must monitor its stability and replace it when necessary.

2. **Storage Requirements** The standard must be stored in a clean, dust-free environment, ideally in a sealed container to prevent contamination. Exposure to air, temperature fluctuations, or direct sunlight can alter its conductivity. Some users may need additional storage solutions (e.g., desiccators or refrigeration), adding to operational costs.

3. **Single-Purpose Use** The ME-51 is optimized for 12.88 mS/cm calibration, which may not cover all conductivity ranges a laboratory encounters. For example:

- **Low-conductivity applications** (e.g., ultrapure water,

- **High-conductivity applications** (e.g., seawater or strong electrolytes, >100 mS/cm) may need separate verification.

This means additional standards may still be required for comprehensive calibration.

4. **Potential for Contamination** Even with proper handling, there is a risk of contamination during transfer or exposure to laboratory surfaces. If the vial is not handled with clean gloves or pipettes, impurities can introduce errors in calibration.

5. **Cost Relative to DI Water** While the ME-51 is cost-effective for frequent use, purchasing it in bulk (x26) may still be more expensive than using deionized (DI) water for rough checks. However, DI water is not suitable for precise calibration due to its instability and lack of a certified value.

6. **Waste Disposal Considerations** Conductivity standards are typically aqueous solutions containing salts or other electrolytes. Proper disposal may require treatment as hazardous waste, depending on local regulations. Laboratories must ensure compliance with environmental and safety guidelines when disposing of used standards.

7. **Dependence on Equipment Compatibility** While the ME-51 is designed for Mettler Toledo sensors, some older or third-party meters may require additional adjustments or verification steps. Users must confirm compatibility with their specific equipment to avoid calibration discrepancies.

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### **Ending Conclusion**

The **Mettler Toledo ME-51 Conductivity Standard (12.88 mS/cm, x26)** is a valuable tool for laboratories requiring precise and traceable calibration of conductivity sensors. Its strengths lie in its **accuracy, stability, ease of use, and compatibility with Mettler Toledo systems**, making it ideal for routine verification in water treatment, pharmaceutical, food, and environmental testing. The bulk purchase (x26) offers cost savings for high-volume users, while its certified value ensures compliance with regulatory standards.

However, its **limited shelf life, storage requirements, and single-purpose nature** necessitate careful handling and supplementary standards for broader conductivity ranges. Laboratories must weigh the **cost, convenience, and long-term reliability** against their specific needs. If frequent, high-precision calibration is required, the ME-51 is a **strong recommendation**. For applications with varying conductivity ranges or budget constraints, users may need to supplement it with additional standards or DI water for preliminary checks.

### **Recommendation**

**Buy the Mettler Toledo ME-51 Conductivity Standard (12.88 mS/cm, x26) if:**

- Your laboratory frequently calibrates conductivity sensors in the 12.88 mS/cm range.

- You prioritize traceability, precision, and compatibility with Mettler Toledo equipment.

- You have proper storage conditions to maintain the standard s integrity.

- Bulk purchase aligns with your budget and usage frequency.

**Consider alternatives or supplements if:**

- Your workflow requires calibration across a wide range of conductivities (e.g., 100 mS/cm).

- You lack proper storage solutions or have limited space for sealed vials.

- Your budget is tight, and you can use DI water for preliminary checks while reserving the ME-51 for critical calibrations.

For most laboratories needing **reliable, certified calibration at 12.88 mS/cm**, the ME-51 is a **highly recommended purchase**. Pairing it with a storage protocol and additional standards for other ranges will ensure comprehensive sensor verification.

Details:

Up for sale are 26 new, old stock Mettler Toledo Conductivity Standard 12.88mS/cm sachets, Cat. Shipping is free to the 50 states. #ME-51 302 050.

part #: me51 prices

  • $64.99-$350.00

specifications plasticwarelabsuppy:

  • brand: Mettler Toledo
  • mpn: Me-51
  • intended use/discipline: Biological Laboratory

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  • started: April 29, 2026
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intended use/discipline: biological laboratory,
category: business & industrial > medical, lab dental supplies > glassware plasticware > medical lab glassware, sku: 13768554955051773,
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3 offers $64.99–$350.00 USD
  • New. Offer #1 priced at $64.99 + $10.00 shipping estimate = $74.99* total. (FL UNIT #5 X1).+$10.00 shipping
  • Used. Offer #2 priced at $340.00 + $131.00 shipping estimate = $471.00* total. +$131.00 shipping
  • Used. Offer #3 priced at $350.00 + $85.00 shipping estimate = $435.00* total. Mistakes do occur.+$85.00 shipping

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