Engineering Value Labeler

Paste part values like 4k7, 10uF or M3x12 and an AI model in your browser labels each quantity and unit and flags odd ones.

Free, private, no signup.

Last updatedHow we build & check our tools

Interactive Tool

This tool runs in your browser and is loading now.

Enter your values once it appears to see your results.

How Engineering Value Labeler works

Press Load model once: your browser downloads Gemma 4 E2B instruction-tuned (web build) (2.0 GB) from this site and keeps it in its cache. Then add your text and press Classify locally. The model runs on this device using your graphics card, so nothing you enter is sent to a server. Until the model is loaded, or if your device cannot run it, the tool falls back to a simple keyword check and labels the result as the fallback.

Gemma 4 E2B instruction-tuned (web build) is a small open language model from Google. The tool sends it the instruction below plus your text, asks for a JSON answer with fixed fields, and shows each field as a card. It runs at temperature 0, so the same input gives the same answer on the same device, though different graphics cards can word it slightly differently.

Inputs longer than 6,000 characters are cut to that length before they reach the model, and the result says so. The model only sees what you paste: it does not look anything up.

The instruction the model gets

You label component and engineering values from parts lists, schematic notes and spec sheets. For each value, say what physical quantity it is (resistance, capacitance, inductance, voltage, current, power, frequency, length, tolerance, torque, wire gauge, thread or fastener size and so on) and its unit. Read common shorthand: 4k7 means 4.7 kΩ, R47 means 0.47 Ω, u is written for µ, and M3x12 is a metric screw size, not the mega prefix. Keep each value as written; do not convert to other units, do arithmetic, or recommend part numbers or suppliers.

What it returns

  • Value by value: One per value: the value as written, an arrow, the quantity and the value in standard notation, e.g. '4k7 → resistance, 4.7 kΩ' or '10uF → capacitance, 10 µF'. Never use the part reference (R5, C2) in place of the value.
  • Unclear values: Values whose meaning is ambiguous, with why.
  • Worth checking: Missing details a reader should confirm, such as tolerance, voltage rating or power rating, based only on the text.

Worked example

The model's output for the built-in sample, recorded on a desktop browser. Your run may word things slightly differently.

Part values: 4k7 resistor, 10uF capacitor, 3.3V rail, 250mA load, M3x12 screw, 0.1 mm tolerance.
Value by value
4k7 → resistance, 4.7 kΩ 10uF → capacitance, 10 µF 3.3V → voltage, 3.3 V 250mA → current, 250 mA M3x12 → thread size, M3x12 0.1 mm → tolerance, 0.1 mm
Unclear values
The voltage rating for the 3.3V rail is not specified. The power rating for the resistor and capacitor is not specified.
Worth checking
Tolerance for the resistor is 0.1 mm, which is unusual for a resistance value and should be confirmed. Voltage rating for the 3.3V rail should be confirmed. Power rating for the resistor and capacitor should be confirmed.

The model

The files are served from this site, versioned so a cached copy is never stale. Nothing is fetched from a third party while you use the tool.

ModelDownloadRuns onLicence
Gemma 4 E2B instruction-tuned (web build)2.0 GBGraphics card (WebGPU)Apache-2.0

Limitations

  • Small language models make mistakes: they can miss an item, merge two, or state something more confidently than the text supports. Check the result against your input before you rely on it.
  • It needs WebGPU and about 8 GB of memory, so it is offered on desktops and laptops, not on phones and tablets. Devices that cannot run it get the keyword fallback, clearly labelled.
  • Results describe the input you gave, not the real-world situation behind it. Review them yourself before acting.

Good uses

  • Sanity-check a pasted BOM line before importing it into a sheet
  • Spot values written in three different notations in the same document
  • Flag ambiguous tokens (is 1M a megohm or a metre?) for human review
  • Keep unreleased part numbers and pricing inside the browser
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Frequently Asked Questions

Common questions about the Engineering Value Labeler

No. The model files download from this site once, and then everything runs in your browser tab. The text you enter is never sent to a server, and closing the tab discards it.
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Sources & References

Number bases and representations

Conventions for binary, octal, decimal, and hexadecimal number representation and conversion.