FT-01: Smallest printed size
<!-- Generated from field-tests/suite.json by tools/field_tests.py. Edit the JSON, not this file. -->
Category: Print · Time: about 10 minutes · Run it and see results: https://openckey.org/tests/test?id=FT-01
What it checks
A standard-layout CKey holding a short link reads when printed at 1 inch (25 mm) wide.
Why
Print size is the first thing a designer chooses and the easiest mistake to make. The core's certification models camera photos down to a few pixels per module; this test checks that model against real printers and real cameras.
Test codes
Print or open the sheet at https://openckey.org/tests/sheet?id=FT-01. It is drawn by the CKey web SDK from the values below.
| Code | Size | Version | Level | Layout | Style | Holds |
|---|---|---|---|---|---|---|
| A | 0.4 in | smallest that fits | M | standard | plain | https://openckey.org/t/FT01-A |
| B | 0.5 in | smallest that fits | M | standard | plain | https://openckey.org/t/FT01-B |
| C | 0.75 in | smallest that fits | M | standard | plain | https://openckey.org/t/FT01-C |
| D | 1.0 in | smallest that fits | M | standard | plain | https://openckey.org/t/FT01-D |
| E | 1.5 in | smallest that fits | M | standard | plain | https://openckey.org/t/FT01-E |
| F | 2.0 in | smallest that fits | M | standard | plain | https://openckey.org/t/FT01-F |
Set up
- Print the test sheet at 100% scale (no "fit to page") on plain white paper.
- Measure code F with a ruler: it must be 2.0 inches (51 mm) wide. If it is not, your printer scaled the sheet; fix the print settings and print again.
- Hold the phone about 20 cm from the sheet in ordinary indoor light.
Steps
- Open the reader.
- Point it at each code from A (smallest) to F (largest), one at a time, for up to 5 seconds each.
- Record whether it read and roughly how many seconds it took.
What to record
- Read within 5 seconds, boolean, required. For each of: A, B, C, D, E, F.
- Seconds to read (s), number, optional. For each of: A, B, C, D, E, F.
Every report also records the device, operating system, reader and its version, and the printer or screen.
How to grade it
- Pass: Code D (1 inch) and every larger code read.
- Partial: Only code E (1.5 inches) or larger read.
- Fail: Code F (2 inches) did not read.
Report a result
- On openckey.org: https://openckey.org/tests/test?id=FT-01, with optional photos.
- On GitHub: open a field-test report and choose FT-01.
Both are published together at https://openckey.org/tests and as JSON at https://openckey.org/api/field/results.