PAL Droid NFC - Refractometer v40
APK · 4 MB · version code 40 · Android 5.0+ · uploaded Apr 30, 2023
- Same certificate as v51, which matches Google Play Details
Quick check before downloading
Answer this to unlock the download. It keeps automated downloaders away.
Compared with the latest version
The latest version is v51, uploaded Nov 17, 2025 — about 2 years after this one.
- Size: this file is 4 MB; the latest is 4.9 MB (963.6 KB larger).
- Android: this version needs Android 5.0+; the latest needs Android 11+. Use this one if your device runs an older Android release.
- The latest version asks for 2 more permissions: Foreground service media playback, Show notifications.
File information
- Version
- v40 (40)
- Uploaded
- Apr 30, 2023
- Size
- 4 MB
- Requires
- Android 5.0+ (API 21)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 6edd51262024e0e27e868a7ef8e03132
- Signing certificate (SHA-1)
- 88:38:FD:B7:AE:73:69:49:36:E7:9D:FE:E1:76:BD:A4:76:04:FB:4D
- Signed by
- CN=Jan Iwanicki, O=Conbest, C=PL
- File name
- conbest-paldroid-nfc-40-64902403-6edd51262024e0e27e868a7ef8e03132.apk
- Package
- conbest.paldroid.NFC
- Downloads (all versions)
- 1K+
- Age rating
- PEGI 3 · Everyone
What's new in v40
Support for new ATAGO refractometers of PAL series and PR series.
Permissions (8)
This version requests 8 permissions, 1 of them sensitive.
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Control vibration android.permission.VIBRATE
- Full network access android.permission.INTERNET
- Nfc android.permission.NFC
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Run foreground services android.permission.FOREGROUND_SERVICE
- View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Certificate issued to “Conbest” This is the certificate of the Google Play version.
- Same certificate as v51, which matches Google Play v51
Store checks
- Developer signature verified Apr 30, 2023
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself.
How to install PAL Droid NFC - Refractometer on Android 5.0+
You'll need about 7.9 MB of free space.
- Download the APK — tap Download APK above (4 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap conbest-paldroid-nfc-40-64902403-6edd51262024e0e27e868a7ef8e03132.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be 6edd51262024e0e27e868a7ef8e03132. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open PAL Droid NFC - Refractometer — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 5.0+). Download it again, or pick an older version.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.