FT-08: Density
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Category: Capacity · Time: about 10 minutes · Run it and see results: https://openckey.org/tests/test?id=FT-08
What it checks
At a fixed 2-inch print size, denser versions need a closer, steadier camera; version 10 still reads.
Why
More data means smaller marks at the same size. This shows where, for an ordinary phone, a code should be printed larger to carry more.
Test codes
Print or open the sheet at https://openckey.org/tests/sheet?id=FT-08. It is drawn by the CKey web SDK from the values below.
| Code | Size | Version | Level | Layout | Style | Holds |
|---|---|---|---|---|---|---|
| A | 2.0 in | 1 | L | standard | plain | https://openckey.org/t/FT08-A |
| B | 2.0 in | 5 | M | standard | plain | https://openckey.org/t/FT08-B |
| C | 2.0 in | 10 | M | standard | plain | https://openckey.org/t/FT08-C |
| D | 2.0 in | 15 | M | standard | plain | https://openckey.org/t/FT08-D |
| E | 2.0 in | 20 | M | standard | plain | https://openckey.org/t/FT08-E |
Set up
- Print the test sheet at 100% scale; each code is 2.0 inches wide.
- Use ordinary indoor light.
Steps
- Try each code, A (version 1) to E (version 20), from about 20 cm, moving closer if needed.
- Allow up to 8 seconds each.
- Record whether it read and the closest distance you needed.
What to record
- Read within 8 seconds, boolean, required. For each of: v1, v5, v10, v15, v20.
- Distance needed (cm), number, optional. For each of: v1, v5, v10, v15, v20.
Every report also records the device, operating system, reader and its version, and the printer or screen.
How to grade it
- Pass: Versions 1, 5 and 10 read.
- Partial: Versions 1 and 5 read but not 10.
- Fail: Version 5 did not read.
Report a result
- On openckey.org: https://openckey.org/tests/test?id=FT-08, with optional photos.
- On GitHub: open a field-test report and choose FT-08.
Both are published together at https://openckey.org/tests and as JSON at https://openckey.org/api/field/results.