A&D FX-300i for Laboratory, Quality Control, Formulation & Small Parts

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The A&D FX-300i laboratory balance is designed for users who need 1 mg readability, fast response and practical data functions in a compact 320 g instrument.

General laboratory weighing

With 320 g capacity and 0.001 g readability, the FX-300i suits sample preparation, reagent weighing, container tare, comparative measurements and routine research where 1 mg resolution is appropriate. Its ~1-second stabilization can improve throughput when many samples are weighed in sequence. For the best performance, keep it away from direct HVAC flow and vibration, use an appropriate breeze break if the room is drafty, and allow samples to reach room temperature before precision work.

Quality control and repeated sampling

Statistical calculation and standard RS-232C make the FX-300i useful for repeated QC checks. A process can capture a series of component weights, calculate summary statistics and export data instead of relying on handwritten transcription. Comparator settings can also classify samples relative to limits. Build the method around a defined sample size, stability criterion, verification schedule and action limit so the balance is part of a repeatable quality process rather than just a display on a bench.

Formulation and small-batch development

A 1 mg display division can be valuable for pigments, catalysts, additives, flavors, powders, adhesives and experimental formulations where each addition is small. The 320 g maximum still leaves room for lightweight containers, but container tare must be included in capacity planning. If a recipe requires uncertainty significantly below 1 mg, a different balance class is required; display resolution alone should never be treated as guaranteed process uncertainty.

Electronics and precision components

Small connectors, terminals, machined pieces, fasteners and electronic components can be counted or compared by weight when their mass is sufficiently consistent. ACAI helps refine the average piece weight as the sample grows. This can speed stock checks or kit preparation. For very light parts, use a larger reference sample and verify the resulting count manually before making inventory adjustments, because natural component variation may be a significant percentage of individual unit weight.

Pharmaceutical and regulated-lab context

A&D publishes a typical USP minimum weight figure around 1.4 g for the FX-300i under its test methodology. Laboratories operating under USP, GMP or another regulated quality system should determine minimum weight and suitability under their own procedures, using actual repeatability data and the applicable uncertainty criteria. A manufacturer’s typical value is useful context but is not a substitute for site-specific qualification or performance verification.

Data capture and traceability

Standard RS-232C plus optional USB, Ethernet and Bluetooth paths make the FX-i platform flexible for data collection. A laboratory can route measurements to a PC, printer or network workflow, depending on installed accessories. Digital transfer reduces transcription risk, but the system still needs identifiers such as sample ID, lot, operator and method. A weight value without context is rarely useful months later during an investigation or audit.

Portable or battery-powered work

A&D offers an optional rechargeable battery for the family, allowing the balance to work away from a fixed outlet. That can help with mobile QC carts or temporary stations. Precision performance still depends on stable setup, so move the instrument carefully, re-level it and verify with a known weight after relocation. Battery operation is a power convenience, not a substitute for a proper weighing environment.

When the FX-300i is not the right choice

Choose something else if routine loads exceed 320 g, if you need 0.1 mg analytical readability, if internal automatic calibration is mandatory, or if a legal-for-trade configuration is required. Higher-capacity FX-i models preserve the platform with coarser readability, FZ-i models add internal calibration, and the “N” variants address legal-for-trade configurations where applicable. Matching the model to the requirement prevents paying for resolution or certification that the process does not use.

FAQ

Is the FX-300i suitable for formulation?

Yes, when the 320 g capacity and 0.001 g display division fit the batch size and process tolerance.

Can it calculate statistics?

Yes. A&D lists a statistical calculation function for repeated measurements.

Can it connect to laboratory software?

It has standard RS-232C and optional communication paths. Software compatibility depends on the receiving system and selected interface.

Can it count electronic components?

Yes, with ACAI, provided individual unit weights and part consistency support reliable counting.

Is the FX-300i a legal-for-trade balance?

MNM identifies the “N” suffix version as the NTEP/legal-for-trade model. The FX-300i without the N suffix should not be represented as that configuration.

Why is the MNM image labeled representative?

Because the artwork displayed on the FX-300i listing uses a source filename referencing the FX-300iN variant. It is the listing image, but we do not present it as guaranteed exact-unit photography.

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