Mettler Toledo ME4002E Precision Balance

Mettler Toledo ME4002E Precision Balance – Used & Refurbished

The Mettler Toledo ME4002E Precision Balance is a reliable general-purpose laboratory balance combining a 4.2 kg maximum capacity with 0.01 g readability. Designed for straightforward routine weighing, the ME4002E is well suited for formulation, sample preparation, reagent weighing, media and buffer preparation, quality control, and other laboratory procedures requiring hundredth-of-a-gram resolution.

Available used and refurbished from American Instrument Exchange, the Mettler Toledo ME4002E provides dependable precision weighing performance in a compact, durable design. Its large stainless steel weighing pan, external calibration capability, integrated RS232 interface, backlit display, and built-in weighing applications make it a practical workhorse for laboratories that prioritize simplicity and reliability. Each balance is inspected, cleaned, calibrated, and tested before shipment and includes a 90-day warranty from American Instrument Exchange.

Key Features

• 4.2 kg / 4,200 g maximum weighing capacity

• 10 mg / 0.01 g readability

• Typical repeatability of approximately 7 mg

• Typical USP minimum weight of approximately 14 g

• Typical minimum weight of approximately 1.4 g at U=1%, k=2

• Approximately 1–1.5 second settling time

• External adjustment

• Large 180 × 180 mm stainless steel weighing pan

• Bright backlit LCD display

• Durable die-cast aluminum and ABS housing

• Overload protection for demanding daily use

• Integrated RS232 interface

• Ten built-in weighing applications

• Front-mounted level bubble and two adjustable feet simplify leveling

• Used, refurbished, calibrated, and tested by American Instrument Exchange

• 90-day warranty included

Overview

The Mettler Toledo ME4002E is designed around a straightforward objective: providing reliable precision weighing without unnecessary complexity.

Its 4.2 kg capacity and 0.01 g readability make it appropriate for a wide range of everyday laboratory procedures. Samples can be weighed directly into beakers, bottles, flasks, containers, and other vessels while retaining enough capacity for both the container tare and material being measured.

The ME4002E is part of Mettler Toledo's ME line of precision balances and incorporates the manufacturer's proven weighing technology in a durable benchtop format. A solid metal base, stainless steel weighing pan, overload protection, and easy leveling make the instrument suitable for frequent use in busy laboratory environments.

Unlike the related ME4002, which incorporates internal adjustment, the ME4002E is an externally adjusted balance. Calibration or sensitivity adjustment is therefore performed using an appropriate external calibration weight.

For laboratories that do not require automatic internal adjustment, the ME4002E provides a simple and economical combination of 4.2 kg capacity, 10 mg readability, rapid stabilization, and proven Mettler Toledo weighing performance.

Common Applications

The Mettler Toledo ME4002E is well suited for formulation, reagent preparation, media and buffer preparation, sample preparation, component weighing, quality control, check weighing, totaling, and general laboratory weighing.

Pharmaceutical and biotechnology laboratories can use the balance for routine sample preparation, weighing reagents, preparing media and buffers, measuring formulation ingredients, and supporting research and quality-control procedures.

Chemical laboratories can use the ME4002E for compound preparation, solution preparation, formulation, percentage weighing, and other routine quantitative procedures.

Food and beverage, cosmetics, materials science, environmental, manufacturing, and academic laboratories can also use the balance for ingredient weighing, sample preparation, research, quality testing, and general quantitative work.

Its 4.2 kg capacity is particularly useful when samples must be weighed directly into larger laboratory vessels rather than small weighing dishes.

Ideal Laboratory Types

The ME4002E is a practical choice for pharmaceutical, biotechnology, chemical, food and beverage, cosmetics, environmental, materials science, academic, manufacturing, and quality-control laboratories.

It is especially appropriate for laboratories that need better resolution than an ordinary bench scale but do not require the sub-milligram sensitivity of an analytical balance.

With 0.01 g readability, the ME4002E provides useful quantitative precision for routine preparation work while its 4.2 kg capacity accommodates significantly larger samples and containers than most analytical balances.

Its straightforward controls and durable construction also make it a good choice for shared laboratory environments where multiple technicians may use the balance throughout the workday.

Precision Weighing Performance

The Mettler Toledo ME4002E provides 10 mg, or 0.01 g, readability throughout its 4.2 kg weighing range.

Typical repeatability is approximately 0.007 g, allowing the balance to produce consistent results during routine laboratory procedures when properly installed and operated.

Mettler Toledo specifies a linearity limit of approximately 0.02 g, with typical performance generally better under appropriate operating conditions.

Settling is also rapid, with manufacturer documentation indicating approximately 1 to 1.5 seconds depending on the specification revision and test conditions. This quick response makes the ME4002E particularly convenient for repetitive weighing tasks.

The combination of 4.2 kg capacity and 10 mg readability places the ME4002E in a useful middle ground between analytical balances and larger general-purpose laboratory scales.

Minimum Sample Weight & USP Applications

Readability should not be confused with minimum sample weight.

Although the ME4002E displays measurements in 0.01 g increments, quantitative procedures require a sufficiently large sample to maintain acceptable measurement uncertainty.

Mettler Toledo specifies a typical USP minimum weight of approximately 14 g for the ME4002E under stated conditions. The manufacturer also specifies a typical minimum weight of approximately 1.4 g at U=1%, k=2.

These values provide useful guidance when determining whether the ME4002E is appropriate for a particular procedure, but they should not replace qualification of the individual installed balance.

Actual minimum weight depends on repeatability, environmental conditions, calibration status, installation quality, and the measurement uncertainty permitted by the laboratory's procedure.

For regulated applications, laboratories should establish and document minimum sample weight according to their own quality system and the actual performance of the installed instrument.

Controlling Vibration & Environmental Influences

The ME4002E is less environmentally sensitive than an analytical, semi-micro, or microbalance, but proper installation still contributes to reliable weighing performance.

Vibration, strong airflow, rapid temperature changes, unstable benches, and improper leveling can affect measurement repeatability and accuracy.

The balance should be installed on a rigid, stable, level work surface away from strong HVAC airflow and significant vibration sources such as centrifuges, shakers, pumps, and compressors.

Mettler Toledo simplifies leveling with two large adjustable feet rather than four. A level bubble positioned toward the front of the balance allows the operator to quickly verify instrument position without awkwardly viewing the rear of the unit.

This simple design can be especially useful in shared laboratories where balances may occasionally be moved for cleaning or workstation reorganization.

External Calibration & Adjustment

One of the most important characteristics to understand about the ME4002E is its external adjustment system.

The closely related ME4002 incorporates internal adjustment, while the ME4002E requires an appropriate external calibration weight for adjustment.

External adjustment is a well-established approach and can provide excellent weighing performance when proper procedures and suitable calibrated weights are used.

For laboratories operating under GLP, GMP, USP, or internal quality systems, external calibration also provides a straightforward opportunity to incorporate traceable calibration weights into routine balance verification procedures.

American Instrument Exchange calibrates and evaluates refurbished ME4002E balances before shipment using appropriate test weights.

Laboratories should establish their own ongoing calibration and verification schedules according to instrument usage, quality requirements, and applicable procedures.

Durable Design & Routine Laboratory Use

The ME4002E was designed as a practical everyday laboratory balance.

Its die-cast aluminum base and ABS housing provide a durable platform for the weighing system, while the stainless steel weighing pan resists normal laboratory wear and is easy to clean.

Overload protection helps safeguard the weighing mechanism from accidental excessive loading during routine operation.

The 180 × 180 mm weighing pan provides ample room for beakers, bottles, flasks, containers, weighing dishes, and other laboratory vessels.

This makes the ME4002E particularly convenient for formulation and preparation procedures where materials can be weighed directly into the vessel that will subsequently be used for mixing, dilution, or processing.

Built-In Applications & Connectivity

The Mettler Toledo ME4002E includes ten integrated weighing applications designed to simplify common laboratory procedures.

Available functions include applications such as density determination, check weighing, totaling, formulation, percentage weighing, piece counting, and other routine weighing tasks.

These built-in functions allow many common calculations and procedures to be performed directly at the balance rather than requiring separate manual calculations.

The ME4002E also incorporates an RS232 interface, allowing weighing results and associated data to be transferred to a compatible printer or computer.

Direct electronic data transfer can reduce manual transcription, improve workflow efficiency, and decrease the risk of errors when recording weighing results.

Key Specifications

Choosing Between External and Internal Adjustment

The ME4002E provides an opportunity to choose a simpler external-adjustment balance rather than paying for an internal calibration mechanism that may not be necessary for every laboratory.

With an externally adjusted balance, an appropriate calibration weight is placed on the weighing pan when adjustment is required. This allows the balance's sensitivity to be verified and adjusted against a known reference mass.

Balances with internal adjustment contain their own internal reference weight and can initiate adjustment without requiring the operator to place an external weight on the pan.

Internal adjustment can be convenient in environments with significant temperature changes or where balances are adjusted frequently.

External adjustment, however, remains entirely appropriate for many laboratories—particularly when calibrated external weights are already incorporated into routine quality-control procedures.

For laboratories comparing the ME4002E with the ME4002, this is the key distinction: the ME4002E uses external adjustment, while the ME4002 incorporates internal adjustment.

Choosing Between a Precision Balance and Analytical Balance

A precision balance such as the ME4002E and a conventional analytical balance serve different laboratory needs.

Analytical balances typically provide 0.1 mg readability and are designed for smaller samples requiring high measurement resolution. Their capacities are generally lower, and an enclosed draft shield protects sensitive measurements from environmental disturbances.

The ME4002E instead provides 4.2 kg capacity with 0.01 g readability.

This makes it considerably more practical for larger samples, containers, formulations, media, buffers, reagents, and general preparation work.

For laboratories weighing ingredients directly into beakers or bottles, the ME4002E's large open weighing pan and kilogram-scale capacity can offer a much more efficient workflow than an analytical balance.

Many laboratories benefit from having both types available: an analytical balance for high-resolution measurements and a precision balance such as the ME4002E for routine preparation and larger samples.

Refurbishment & Performance Testing

Every used Mettler Toledo ME4002E sold by American Instrument Exchange is inspected, cleaned, refurbished as necessary, calibrated, and tested before shipment.

Our technicians use appropriate calibration weights to evaluate critical performance characteristics including accuracy, repeatability, linearity, corner-load tolerances, and reduced span at or near full capacity.

Because the ME4002E uses external adjustment, particular attention is given to verifying proper response to known calibration weights across the weighing range.

The weighing system, display, controls, leveling components, weighing pan, RS232 interface, and other installed functions are also inspected and tested for proper operation.

The balance is thoroughly cleaned and receives a final operational inspection before shipment.

Each refurbished ME4002E includes a 90-day warranty from American Instrument Exchange.

Shipping & Installation Considerations

Precision balances should be carefully handled during transportation to protect their weighing systems and electronics.

American Instrument Exchange securely prepares the ME4002E for shipment, protecting the weighing pan, display, load cell, and other components during transportation.

Once received, the balance should be installed on a rigid, level, vibration-resistant work surface away from strong airflow and significant mechanical vibration.

The front-mounted level bubble and two adjustable feet simplify leveling after installation.

After the balance has acclimated to its new environment, external adjustment should be performed using an appropriate calibration weight before critical quantitative procedures begin.

For regulated applications, installation should be followed by appropriate calibration, verification, or qualification according to the laboratory's quality system.

Related Laboratory Equipment

American Instrument Exchange maintains an extensive inventory of used and refurbished laboratory balances, including analytical balances, semi-micro balances, microbalances, and precision balances for applications ranging from routine sample preparation to high-resolution quantitative analysis.

Labs developing complete analytical or sample-preparation workflows can also source centrifuges, water baths, incubators, laboratory refrigerators, laboratory freezers, and other refurbished laboratory equipment from American Instrument Exchange.

Mettler Toledo ME4002E Precision Balance FAQs

What is the maximum capacity of the Mettler Toledo ME4002E?

The ME4002E has a maximum weighing capacity of 4.2 kg, or 4,200 g, making it suitable for routine samples, laboratory containers, formulations, reagents, and preparation procedures.

What is the readability of the ME4002E?

The ME4002E provides 10 mg, or 0.01 g, readability throughout its weighing range.

What is the typical repeatability of the ME4002E?

Mettler Toledo specifies typical repeatability of approximately 0.007 g, or 7 mg, under appropriate operating conditions.

What is the typical USP minimum weight of the ME4002E?

Mettler Toledo specifies a typical USP minimum weight of approximately 14 g under stated conditions. Actual minimum weight should be established according to installed balance performance, environmental conditions, measurement uncertainty, and laboratory procedures.

Does the ME4002E have internal calibration?

No. The ME4002E uses external adjustment. An appropriate external calibration weight is required when performing balance adjustment.

What is the difference between the ME4002 and ME4002E?

Both models provide 4.2 kg capacity and 0.01 g readability. The major difference is adjustment: the ME4002 has internal adjustment, while the ME4002E uses external adjustment.

How large is the ME4002E weighing pan?

The balance has a 180 × 180 mm stainless steel weighing pan, providing ample space for common laboratory bottles, beakers, flasks, containers, and weighing vessels.

Is the ME4002E suitable for buffer and media preparation?

Yes. Its combination of 4.2 kg capacity, 0.01 g readability, and a large open weighing pan makes it well suited for buffer, media, reagent, and solution preparation.

Can the ME4002E connect to a printer or computer?

Yes. The ME4002E has an RS232 interface that can be used with compatible printers, computers, and other laboratory peripherals.

Why purchase a refurbished Mettler Toledo ME4002E?

A refurbished ME4002E provides laboratories with 4.2 kg capacity, 0.01 g readability, proven Mettler Toledo weighing technology, a durable metal base, built-in applications, and straightforward external adjustment without the acquisition cost associated with comparable new equipment. American Instrument Exchange tests, calibrates, cleans, and refurbishes each balance before shipment and provides a 90-day warranty.