A&D EJ-123 Counting, Density, USB, RS-232 & Bluetooth Guide

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A&D EJ-123 counting and data functions turn the 120 g × 0.001 g balance into a small workflow instrument rather than a simple gram display. ACAI counting, percentage weighing, accumulation, optional density measurement and multiple communication choices allow one compact balance to support inventory, teaching, quality-control and documentation tasks.

ACAI parts counting

The EJ-123 supports 5, 10, 25, 50 and 100-piece sample sizes. After a sample establishes the starting unit weight, Automatic Counting Accuracy Improvement can refine the average as additional pieces are added. This is valuable for very small hardware and electronic parts because a larger effective sample reduces the influence of small part-to-part weight differences. The model’s published minimum unit weight is 0.001 g and maximum displayed count is 120,000 pieces, but practical accuracy depends on the consistency of the actual parts.

Percentage mode

Percent mode stores a reference as 100% and then displays subsequent weights relative to that reference. MNM lists a 0.1 g minimum 100% weight and a 0.01% minimum display. Useful examples include coating pickup, moisture-loss demonstrations, formulation comparisons, sample recovery and checking whether material additions match a target ratio. Percentage mode is most useful when the reference itself is measured carefully and is large enough to give a stable ratio.

Density measurement

A&D supports automatic density calculation for the EJ-123/303 with the optional EJ-13 density kit. That can be used for educational Archimedes-method exercises and basic material comparisons. Use the proper kit and follow the manufacturer’s liquid, temperature and setup instructions; improvised hanging fixtures can add side load or friction and produce misleading results.

Accumulation and repeated measurements

The accumulation function adds accepted weighing results to a running total. This can help when a total batch consists of several additions that cannot all remain on the pan at once, or when multiple counted lots are processed sequentially. Operators should still record the number of additions and clear the accumulator intentionally between jobs so a previous total is not carried into a new batch.

Quick USB, RS-232C and Bluetooth options

A&D lists EJ-02 Quick USB, EJ-03 RS-232C and EJ-27 Bluetooth communication options. Quick USB is designed for easy one-way transfer to a computer without specialized driver software in common workflows. RS-232C supports bidirectional integration with PCs, printers and data loggers. The Bluetooth option supports wireless communication with compatible A&D devices. A critical configuration rule is that EJ-02, EJ-03 and EJ-27 cannot be installed at the same time, so choose the interface around the actual data path you need.

GLP-style output and documentation

The EJ family supports GLP/GMP/GCP/ISO-oriented output when the appropriate communication path is installed. Calibration reports can include model, serial number, ID information, calibration type, weight values and signature fields. For a teaching or quality lab, this is useful because it moves the process from simply reading a display to maintaining auditable weighing records. Build a consistent file-naming or batch-ID process so exported measurements remain connected to the correct sample.

Choosing the right interface

Choose Quick USB when the goal is simple weight transfer to a nearby Windows PC. Choose RS-232C when you need printer compatibility, bidirectional commands, a data logger or industrial integration. Choose Bluetooth when a cable-free layout has more value than a wired interface. If you only need manual weighing, leaving the balance without an interface avoids unnecessary complexity. The interface should solve a real workflow problem rather than simply add features.

FAQ

What is ACAI?

Automatic Counting Accuracy Improvement refines the stored average unit weight as more sample pieces are added, improving the basis for the count.

Can USB and RS-232 be installed together?

No. A&D states that EJ-02, EJ-03 and EJ-27 cannot be used at the same time.

Can the EJ-123 calculate density?

Yes, with the EJ-13 density determination kit intended for the EJ-123/303.

Does Quick USB require special weighing software?

A&D describes Quick USB as a simple one-way PC transfer option designed to work without special software installation for common data-entry workflows.

Can the balance print calibration records?

With the proper interface and compatible printer or computer workflow, the EJ series supports GLP-style calibration and data output.

Is counting accurate for every 1 mg part?

Not necessarily. The published minimum unit weight is a capability limit; real counting performance depends on unit-weight variation, sample size, stability and environment.

View the A&D EJ-123 on MNM Scales