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Thermometers

NT-05 PRECISION THERMOMETER YELLOW GLASS

Length 120 mm., in nickel plated brass reversible case with a clip. Also available in plastic case. Cat. No. Graduation  Range Length mm. 16.01 1°C -10 to 500C 145 16.02 1°C -10 to 1100C 145
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Thermometers

NT-16 POCKET THERMOMETER

Design and Features The NVG-10 burette is a high-quality, precision instrument made from borosilicate glass, which is highly resistant to thermal shock and chemical corrosion. The burette has a long cylindrical body, marked with graduations along its length to allow precise readings of the liquid volume being dispensed. The graduations are often printed with high-contrast ink, which makes reading measurements easy and minimizes the risk of parallax errors. The distinguishing feature of this burette is its straight bore stopcock made from PTFE (Polytetrafluoroethylene), commonly known by the brand name Teflon. PTFE is well known for its excellent chemical resistance, non-stick properties, and high tolerance to temperature variations. This makes the NVG-10 burette ideal for use with a wide range of reagents, including acidic, basic, and organic solutions, as PTFE is virtually inert to most chemicals found in laboratory settings. The straight bore design of the stopcock allows the liquid to flow smoothly through the valve, reducing the potential for blockages or irregularities in dispensing. The stopcock can be easily rotated to control the flow rate of the liquid being dispensed, allowing for fine control during titrations. The PTFE stopcock is also leak-proof, providing confidence in accuracy and ensuring no loss of solution during use. Uses and Applications The NVG-10 burette with a PTFE key stopcock is primarily used for volumetric analysis, particularly in titration experiments. Titration is a common analytical procedure used to determine the concentration of a solution by reacting it with a solution of known concentration, called a titrant. The burette’s accuracy and easy control make it essential for various laboratory applications, including: Acid-Base Titrations: Acid-base titrations are among the most common uses of the NVG-10 burette. In these experiments, the burette is used to accurately dispense an acid or base solution into a flask containing the analyte and an indicator. The precise control offered by the PTFE stopcock allows the titrant to be added dropwise as the endpoint is approached, ensuring the reaction is stopped at the exact point where neutralization occurs. Redox Titrations: Redox titrations involve the transfer of electrons between reactants and are used to determine the concentration of oxidizing or reducing agents in a solution. The NVG-10 burette is particularly suitable for dispensing the titrant in redox reactions, where precise volume control is necessary to accurately determine the equivalence point. Complexometric Titrations: In complexometric titrations, a chelating agent, such as EDTA, is used to form a complex with metal ions. The NVG-10 burette is used to dispense the chelating agent while monitoring the formation of the complex, typically with the use of an appropriate indicator. The accuracy of the NVG-10 ensures that even trace concentrations of metal ions can be accurately determined. Quality Control in Industrial and Research Settings: Industries such as pharmaceuticals, food and beverage production, and water treatment often rely on titration for quality control and product analysis. The NVG-10 burette is ideal for these settings, providing the precision needed to ensure that products meet stringent quality and safety standards. Advantages of PTFE (Teflon) Key Stopcock The PTFE key stopcock is a critical feature of the NVG-10 burette that provides several advantages: Chemical Resistance: PTFE is highly resistant to a wide range of chemicals, including strong acids, alkalis, and organic solvents. This ensures that the stopcock remains unaffected by the chemical reagents being dispensed, reducing the risk of degradation or contamination. This chemical resistance makes the NVG-10 burette versatile and suitable for use with a wide range of reagents. Smooth and Reliable Flow Control: The straight bore design of the PTFE stopcock ensures a smooth, unrestricted flow of liquid. The non-stick properties of PTFE minimize friction, allowing for easy and precise adjustments to the flow rate, which is essential during titration. This smooth control is particularly useful when approaching the endpoint, where dropwise addition of the titrant is required. Leak-Proof Operation: The PTFE stopcock is designed to provide a secure, leak-proof seal. This prevents loss of the titrant and ensures the accuracy of the titration process. The tight seal also minimizes the risk of contamination by preventing external substances from entering the burette. Ease of Cleaning and Maintenance: PTFE is easy to clean due to its non-stick properties. Residues from previous experiments do not adhere to the PTFE surface, making it easy to rinse and clean the stopcock between uses. This feature helps to maintain the accuracy and reliability of the burette over time. Calibration and Accuracy The NVG-10 burette is calibrated to ensure high accuracy, which is crucial for titrations and other volumetric analyses. The graduations are marked clearly, allowing the user to accurately measure the volume of the dispensed liquid. The accuracy of the burette is often expressed as a percentage of the total volume, and the NVG-10 burette typically meets or exceeds the standards required for Class A accuracy. This level of precision is vital in quantitative analyses where even a slight deviation in volume could lead to incorrect results. Handling and Maintenance Proper handling and maintenance of the NVG-10 burette are crucial to ensuring its longevity and accuracy: Cleaning: After each use, the burette should be thoroughly cleaned to prevent any residues from affecting future titrations. The PTFE stopcock can be easily removed and cleaned separately to ensure that no chemicals are left inside the bore. For cleaning, the burette should be rinsed with deionized water, followed by the solvent appropriate to the reagents used. Storage: The burette should be stored in an upright position to prevent the stopcock from becoming damaged or blocked. It is also essential to keep the stopcock open when not in use to avoid unnecessary stress on the sealing surfaces. Calibration Check: Regular calibration checks are recommended to ensure that the burette maintains its accuracy. Calibration should be done periodically or if the burette is suspected to be inaccurate.
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Volumetric Glasswares

NVG-10 BURETTES WITH STRAIGHT BORE PTFE (TEFLON) KEY STOPCOCK

1. Description and Features The NVG-40 measuring cylinder with spout is designed for accurate liquid measurement, specifically catering to experiments and procedures that require precision. These cylinders have a series of distinct features that make them suitable for a wide range of uses: Capacity and Calibration: These measuring cylinders come in various capacities, from as small as 10 ml up to 2 liters or more, depending on user requirements. Each cylinder is calibrated for accuracy, generally according to industry standards, with clear, permanent graduations that allow easy reading. Graduations are marked in both milliliters (ml) and liters (L), allowing for convenient measurement of volumes. Design: Spout: A major distinguishing feature of NVG-40 cylinders is the spout, which allows for controlled and precise pouring of liquids. This helps in preventing spills, reducing waste, and ensuring accurate transfers of liquids. Hexagonal Base: Many NVG-40 measuring cylinders are equipped with a hexagonal base, providing stability and preventing them from easily tipping over during use. This stability is particularly important when working with volatile or hazardous chemicals. Graduation Lines: The graduations are evenly spaced, with clear numerical labels to enable accurate measurements. Typically, the markings are printed in contrasting colors to enhance visibility, even for small amounts of liquid. Material: The NVG-40 measuring cylinders are made from either borosilicate glass or polypropylene (PP) plastic. Borosilicate glass is heat-resistant and chemically inert, making it suitable for working with various reagents, including acidic or basic solutions. Polypropylene plastic is lightweight, resistant to breakage, and compatible with a range of chemicals, but it is less heat-resistant compared to borosilicate glass. Ergonomic Design: The spout and the cylinder are designed to minimize dripping, allowing easy, mess-free pouring. The presence of a thumb rest on some versions ensures that users have a good grip, making them ideal for controlled operations even when one hand is used. Tolerance and Accuracy: The accuracy of these measuring cylinders is defined by their tolerance, which is the allowable range of error in measurements. Generally, the tolerance level meets ISO or ASTM standards, depending on the specific cylinder type. 2. Uses and Applications NVG-40 measuring cylinders with spout are used extensively in both educational and professional laboratories due to their versatility. Below are some of the key applications: Laboratory Use: NVG-40 measuring cylinders are a fundamental part of any laboratory setup, primarily used for measuring liquids with precision. They are widely used in titration processes, where precise volumes of a solution must be added in controlled increments. They can also be employed in preparing solutions by mixing different chemicals, where maintaining an accurate ratio is essential. Industry Use: In the pharmaceutical industry, these measuring cylinders are used for formulation, dilution, and preparation of solutions for further processing. Chemical industries employ measuring cylinders to test the quality of raw materials, create sample mixtures, and for research and development purposes. Educational and Research Institutions: NVG-40 measuring cylinders with spouts are ideal for educational institutions, where students can learn the basics of measurement in chemistry and physics experiments. They are also used in research laboratories for a variety of experiments, ranging from biological assays to materials research. Food and Beverage Industry: Measuring precise volumes is key in the food and beverage industry. These cylinders help in quality control, ensuring that ingredients are added in the correct proportions, and in analyzing products. Environmental and Water Analysis: NVG-40 cylinders are also used in environmental labs, for example, to measure water samples to determine the concentration of contaminants or to perform other tests on wastewater or effluents. 3. Material Properties The choice between borosilicate glass and polypropylene largely depends on the intended use: Borosilicate Glass: Heat Resistance: Borosilicate glass has a very low coefficient of thermal expansion, making it resistant to temperature changes. It can be autoclaved and used for hot liquids. Chemical Compatibility: Borosilicate is resistant to most chemicals, except for hydrofluoric acid. This makes it ideal for work involving reactive chemicals. Transparency: It offers a clear view of the liquid being measured, allowing easy monitoring of the meniscus to read volumes accurately. Polypropylene Plastic (PP): Durability: Polypropylene is highly resistant to breaking and is more durable than glass, which is especially useful for fieldwork or situations where equipment could be dropped. Chemical Resistance: It is resistant to various chemicals, though not suitable for strong acids or bases. Cost: Polypropylene is generally less expensive than borosilicate, making it a cost-effective option for large-volume use or where breakage is a concern. 4. Maintenance and Care To ensure the longevity and accuracy of NVG-40 measuring cylinders, proper care and maintenance are required: Cleaning: Always clean the measuring cylinder after each use. Borosilicate glass cylinders can be washed with laboratory-grade detergents, while polypropylene cylinders should be rinsed with lukewarm water to avoid deformation. It is important to ensure that no chemical residues are left, as they can interfere with future measurements. Handling: Avoid sudden temperature changes with borosilicate glass cylinders, as this can lead to cracking. Ensure the measuring cylinder is placed on a flat, stable surface to prevent tipping over. The hexagonal base design provides additional stability. Storage: Store the measuring cylinders in a dry environment to prevent the buildup of residue or the potential for breakage. Glass cylinders should be stored separately or with padding to avoid contact with other glassware, which could cause damage. 5. Advantages and Limitations Advantages: The spout design allows for easy pouring without spills, making it ideal for applications that require precision. The clear graduation markings provide easy volume measurement, ensuring reproducibility in experiments. Both glass and polypropylene versions offer versatility, catering to the varying needs of different types of laboratories. Limitations: Glass cylinders are prone to breakage and may not be ideal in environments where robust handling is required. Plastic cylinders are more prone to scratching, which can make reading the graduations difficult over time. There is a limited range of volume when compared to other volumetric devices like burettes or pipettes, making it less suitable for extremely precise measurements.
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Volumetric Glasswares

NVG-40 MEASURING CYLINDERS WITH SPOUT

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Surgical Instruments & Hospital Equipment

Obstretric Labour Table

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Surgical Instruments & Hospital Equipment

Officer Dissecting Forceps

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Surgical Instruments & Hospital Equipment

Ogilvie Cholecystectomy Forceps

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Surgical Instruments & Hospital Equipment

Ogilvie Retractor,

OINTMENT SLAB
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Chemicals

OINTMENT SLAB

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Surgical Instruments & Hospital Equipment

Ollier Retractor

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Surgical Instruments & Hospital Equipment

Olsen-Hegar Holder and Scissors

ONION HOE
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Biological Apparatus & Material

ONION HOE