
ACS ACR39U
Small, portable and easy to use.
- iOS
- Testing passed
- Android
- Testing in progress
Check the connector before buying. USB-A readers need a USB-A to USB-C data adapter for USB-C phones.
My Tacho · card readers
Compare readers, connect your card and get help when you need it.
Published results from Drivers Logbook; check the exact reader model, connector and platform. See the original test guide.

Small, portable and easy to use.
Check the connector before buying. USB-A readers need a USB-A to USB-C data adapter for USB-C phones.

The lowest-cost reader in our test selection. Exact purchase link coming soon.
Check the exact model and connector. Similar-looking readers can use different hardware.

USB-A connection · USB-A to USB-C data adapter required for USB-C phones.

USB-A connection · USB-A to USB-C data adapter required for USB-C phones.

Check the connector before buying. USB-A readers need a USB-A to USB-C data adapter for USB-C phones.
First, download My Tacho from the App Store or Google Play.
Use a data adapter if needed. CHERRY and Identiv need a USB-A to USB-C adapter for USB-C phones.
Follow the chip direction on the reader. On Android, allow USB access when asked.
Tap “Read my driver card”, then review the imported records. Keep it connected until finished.
Your first successful supported import is free. Further imports require the one-time unlimited-imports unlock. Lightning connections are not yet tested. The app reads your card without changing it; it does not replace statutory downloads.
Purchase links are coming soon. Any affiliate links will be labelled; we may earn a commission from qualifying purchases.
Unlock your phone, reconnect the reader and scan again. Check your adapter supports data, not just charging. On Android, allow USB access.
Check the chip direction and push the card fully into the slot. Remove it, reinsert it and try again.
Keep your phone unlocked and the cable still. Reconnect and try once more. If it keeps failing, contact us with the error message, platform, app version and reader name.
Check “Activity assessed up to” on Today. Assessment ends at the last supported card-out boundary; later time is not an automatic evidence gap. At your next card insertion, use the tachograph’s manual-entry prompt to record what actually happened, then read your card again. This does not automatically repair older gaps.
Still stuck? Contact support.
My Tacho reads Gen 1-compatible driver records, including backward-compatible records on Gen 2 cards. Newer smart-card fields such as GNSS locations are not analysed. Supported saved files include .ddd, .tgd, .c1 and compatible JSON snapshots. Gen 2-only files and vehicle-unit files are not supported. Bluetooth reading is not available.
Reader snapshots are unsigned personal records, not full signed statutory downloads. Only read your own card. Later reads are checked against your driver identity; a replacement must pass the identity check before you can confirm it.
Read the My Tacho user guide