A category groups related items together — e.g. a product line, formulation, or material. Turn this off in Settings › Functions if you don't need to organize items by category — every item then simply shows as "No category".

Categories are turned off — items don't need one. Turn "Categories" on in Settings › Functions to organize items into categories.

Record a reference/standard reading for an investigation type, using the same measure-and-correct flow — leave category and item unset for a general standard. Pick a category and item to link it to that item instead: its first readings join the baseline automatically (as many as your configured baseline count, in Settings), and the baseline manager below lets you review every reading, include or exclude any of them, see them charted, or auto-suggest the tightest 3–10 readings as the baseline.

A container records what a measurement was physically taken in — e.g. a vial, dish, or tray — for items that get measured in more than one. Give an item a default container in Library so it's pre-filled at Measure, or leave it unset and pick one per reading.

Turn on "Item containers" in Settings › Measurement to add and use containers.

A pull measured within this many days of its due date counts as on time.

At least 3: the T0 readings of a batch are its reference, and three readings give a usable mean and spread.

One row per replicate reading of every measured pull, with batch, condition, time point, Lab values, result and verdict. For Excel and other tools.

All studies with plans, pulls, readings and change logs, the tasks, and the stability settings (lists, tolerance, replicates).

Account

Account

Team members

Invite a teammate

Automatic sign-out

Signs everyone out on this device after this much inactivity.

Users on this device

Admin access

Reference required — a reading of this investigation type can't be saved until a baseline reference has been established or selected for that item. Batch required — every reading of this investigation type must have a batch number entered before it can be saved. Strict mode — readings of this investigation type can never be deleted, only corrected with a required reason, and every correction or archive is recorded in the audit log. Default color formula — sets which ΔE formula a brand-new item under this investigation type starts with (never enforced on existing items). ΔE76 is the original, simplest color-difference calculation — straightforward, but the same numeric value can look like a bigger or smaller difference depending on the color, since it doesn't account for human color perception. ΔE2000 is the current industry-standard formula — it corrects for that by weighting lightness, saturation and hue the way the eye actually perceives them, so its numbers are more perceptually accurate, especially for saturated colors — at the cost of a more complex calculation.

Corrective and Preventive Action: closes the loop after a failed/action-level reading — investigate why, fix it, verify the fix worked, and prevent recurrence. Triage happens immediately (redo, accept with a reason, or escalate to a CAPA); investigation and verification happen later, once someone has time. Default due date — how many days from opening a CAPA its due date defaults to. Recurrence window / threshold — if the same item fails this many times within this many days, Treflex suggests opening a CAPA even if nobody escalated it at the time. Close/verify role — who may mark a CAPA's effectiveness verified (deliberately stricter than who may investigate it, so the same person isn't automatically the one who signs off).

Who corrected or archived what, when, and why — a read-only record. Never edited or deleted from here.

No audit-log entries yet.

Full photos are stored on this device only. Choose how long to keep them before they're deleted automatically; the measurement data itself is kept regardless.

Lower quality means smaller files and more photos fit in storage, at the cost of some visible compression artifacts. This only affects newly saved photos — existing ones are unchanged.

Two printable A4 pages with the same reference chart: one for powders or liquids in a cup with a dark rim (plain grey field), one with a printed rectangular frame for flat items. One photo of the whole page covers both colour correction and the sample.

Self-printed charts are not recommended: consumer printers and papers vary in color accuracy, so a chart printed at home or in the office may not match the reference values the app expects, which reduces measurement accuracy. Use a professionally printed chart wherever consistent, traceable results matter, and record its calibration date below.

The colour chart alone, 210 × 100 mm at 300 dpi, sRGB, for ordering a matt fine-art or photo print. Order it at exactly 21 × 10 cm with the lab's automatic image optimisation switched off, on matt paper without optical brighteners. Place it above the sample in the photo, as on the A4 page.

How to use: print at 100 % ("Actual size", not "Fit to page"), keep the page flat and matt, and photograph the whole page. The chart corrects the colour. Cup page: use a cup with a dark, matt rim; the app finds the rim and measures the area inside it, minus 10 % at the edge. Frame page: place the item inside the printed frame.

Record the date this specific reference chart was last verified against a known-good standard (or first put into use). Printed color charts drift and fade over time — CATO warns you here and before a measurement once it's more than 12 months old.

A full run-through, start to finish. Do steps 1–2 once per sample; repeat step 5 for every new measurement.

1. Set up in Settings
Define your investigation types (e.g. QC, RID) and turn containers on if you use them. Set how many reference readings should make up a baseline.

2. Add your items in Library
Create categories, then add your items (and containers, if used).

3. Print your reference sheet
Download the chart + marker page from Settings and print it at 100% scale, with no automatic color enhancement — that keeps the printed colors close to the exact values the app expects.

4. Record a baseline for each item
In Library, record reference measurements for the item — the number of readings is whatever you set in step 1. These become the item's baseline. Its tolerance (fail limit) defaults to four times the standard deviation of these baseline readings, i.e. of how much the reference itself naturally varies from reading to reading. You can leave this default or set your own tolerance manually in Library, either right after recording the baseline or any time later.

5. Take measurements
Go to Measure, photograph the sheet together with your item, and save the reading.

6. Track it in History
See drift (ΔE) from the baseline, per-channel trends, and comparisons across items over time.

Treflex

Photograph your item placed inside the marker area of the reference sheet. The app finds the chart's 4 corner markers automatically, corrects the photo's colors against 48 known reference patches, then logs the corrected color of whatever you select.

Measure — take a photo, confirm the correction, save a reading.

History — browse past readings, see drift from a baseline, compare samples.

Library — manage samples, containers, and reference/baseline readings.

Settings — users, investigation types, theme, language, and data backup.

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