A&D FX-300i 320 g × 0.001 g Precision Balance Guide

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The A&D FX-300i precision balance combines 320 g capacity with 0.001 g readability, fast stabilization and professional data functions for laboratory, quality-control, formulation and small-component weighing.

Core FX-300i specifications

A&D’s official FZ-i/FX-i specification table lists the FX-300i at 320 g maximum capacity and 0.001 g readability. Published repeatability is 0.001 g and linearity is ±0.002 g. The standard weighing pan is 130 mm in diameter, and the body is approximately 193 × 262.5 × 85.5 mm. A&D lists typical stabilization around one second under appropriate conditions, which is valuable for repeated bench work where waiting several seconds for every sample can slow throughput.

Compact Super Hybrid Sensor technology

The FX-i family uses A&D’s Compact Super Hybrid Sensor architecture to combine fast response and fine readability in a relatively compact enclosure. For the user, the practical benefit is the ability to work at 1 mg display resolution without the larger footprint of many traditional laboratory balances. The instrument still needs a solid, level surface and protection from drafts and vibration; sensor speed cannot cancel a poor weighing environment.

External calibration, not internal automatic calibration

A critical distinction in A&D’s FZ-i/FX-i family is calibration method. The FZ-i models include an internal calibration mass, while the FX-i models—including the FX-300i—use external-weight calibration. A&D’s manual explicitly notes that FX-i models do not have the FZ-i one-touch internal calibration mechanism. If internal motorized calibration is a requirement, choose an FZ-i model rather than assuming the similar housing means both versions calibrate the same way.

RS-232C and optional connectivity

RS-232C is standard, allowing connection to a computer, printer or data logger with compatible settings. Optional connectivity includes Quick USB, Ethernet and Bluetooth-related accessories depending on configuration. A&D notes that certain interface options such as FXi-02, FXi-08 and FXi-09 cannot be installed simultaneously, so choose interfaces around the actual data path you need. For a simple laboratory PC, Quick USB can reduce setup friction; for bidirectional integration or legacy instrumentation, RS-232C is often more flexible.

Counting, percent, statistics and comparator functions

The FX-300i supports ACAI parts counting, percent weighing, statistical calculation and comparator functions. ACAI improves the average unit-weight estimate as additional pieces are added, making the balance useful for small precision components. Statistical calculation can summarize repeated measurements for process checks. Comparator outputs classify values relative to selected limits and can support pass/fail workflows. Each of these functions is most effective when the underlying weighing process is stable and the sample variation is understood.

Underhook and animal-weighing functions

A&D lists an underhook for below-balance weighing and an animal-weighing mode for unstable loads. The underhook can support density or awkward-object workflows when the fixture hangs freely. Animal mode averages a moving load to produce a more usable result. Neither function changes the balance’s capacity or mechanical limits; suspended fixtures, dynamic samples and containers must still be kept within the rated load and used without side force.

Typical minimum weight context

A&D publishes a typical USP minimum weight value of about 1.4 g for the FX-300i under its stated methodology. This is not the same as saying every 1.4 g sample automatically meets every laboratory’s uncertainty requirement. Minimum weight depends on repeatability, risk, method and acceptance criteria. For regulated or validated work, establish minimum weight from the specific balance in its actual environment and under the applicable quality procedure.

FX-300i versus FX-300iN

MNM distinguishes the FX-300i from the FX-300iN by explaining that models with the “N” suffix are the NTEP/legal-for-trade versions. The FX-300i discussed here is the non-N version and should not be represented as the legal-for-trade configuration. That distinction matters for jewelry sales, commercial transactions and other applications where weight determines price. Internal process control, research and formulation do not automatically require NTEP approval, so the non-N model can be the appropriate technical choice when commercial certification is not needed.

Image note

The product image used here is the actual artwork displayed on MNM’s FX-300i listing, but the source filename references FX-300iN. Because those models share the FX-i platform but differ in legal-for-trade configuration, the image is labeled representative rather than presented as guaranteed exact model photography.

FAQ

What is the FX-300i capacity and readability?

A&D specifies 320 g capacity and 0.001 g readability.

Does the FX-300i have internal calibration?

No. The FX-i version uses external-weight calibration. Internal automatic calibration is a feature of the corresponding FZ-i family.

Does it include RS-232C?

Yes. A&D lists RS-232C as standard.

How fast does it stabilize?

A&D publishes approximately one-second stabilization under suitable conditions.

Is the FX-300i NTEP?

MNM distinguishes the non-N FX-300i from the FX-300iN legal-for-trade/NTEP variant. Confirm the exact suffix on the delivered model when certification matters.

Can it count parts?

Yes. ACAI counting is supported and is particularly useful for small uniform components.

Manufacturer documentation: A&D FZ-i / FX-i Series

View the A&D FX-300i on MNM Scales