# Watchlog Bluetooth — Bluetooth Data Collection App

> Bluetooth data collection app for Hydrotechnik sensors. (iPhone/iPad app by Hydrotechnik UK Test Engineering Ltd.)

- Source: https://appshunter.io/ios/app/watchlog-bluetooth/id6479214506 (this page in markdown: same URL + `.md`)
- Developer: [Hydrotechnik UK Test Engineering Ltd](https://appshunter.io/developer/1515531717)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 25 MB
- Languages: English
- Released: 2024-05-06
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/watchlog-bluetooth/id6479214506/reviews.md

## What is Watchlog Bluetooth?

Bluetooth connection app for use with Hydrotechnik sensors.

## Key features

- Bluetooth connectivity
- Hydrotechnik sensor support
- Data collection
- Data management

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/watchlog-bluetooth/id6479214506/reviews.md

### 5/5 — Simple but effective pressure monitoring app

*2024-05-07, version 1.0*

This app is simple to use and looks great too. Connects easily to the Watchlog digital pressure gauges we have and allows for monitoring up to 4 gauges at once. Simple to record also and transfer the csv file via file share (outlook, WhatsApp etc).

### 5/5 — A surprisingly useful App for pressure testing

*2024-05-07, version 1.0*

Measuring and recording 4 pressure sensors in real time was easy with this App. 

The scanning rate was 10 times per second and the data viewable in Excel after the recording stopped.

## Frequently asked questions about Watchlog Bluetooth

### What is Watchlog Bluetooth used for?

Watchlog Bluetooth is a utility app designed to establish Bluetooth connections specifically for collecting data from Hydrotechnik sensors. It facilitates the transfer and management of this sensor data.

### Is Watchlog Bluetooth free to download?

Yes, Watchlog Bluetooth is available for free download. There are no costs associated with acquiring the application itself.

### What devices is Watchlog Bluetooth compatible with?

Watchlog Bluetooth is compatible with iPhone, iPad, and iPod devices. It is designed to run on Apple's iOS ecosystem.

### Does Watchlog Bluetooth have ads?

No, Watchlog Bluetooth does not contain advertisements. Users can expect an ad-free experience while using the application.

### How often is Watchlog Bluetooth updated?

The latest version of Watchlog Bluetooth is 4.2.0, released on March 23, 2026. While the last update date is in the future, indicating potential for ongoing development, users can expect regular updates based on typical app release cycles.

### What is the age rating for Watchlog Bluetooth?

Watchlog Bluetooth has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### Can Watchlog Bluetooth connect to any Bluetooth device?

No, Watchlog Bluetooth is specifically designed to connect with Hydrotechnik sensors. It is not a general-purpose Bluetooth connection app for all devices.

## Version history (last 5 releases)

### 4.4.0 — 2026-04-08

Calculation channels

Two new calculation channels are now available from the Calc button in the live screen.

- A-B Differential — shows the real-time difference between two connected pressure sensors
Power (PWR) — calculates hydraulic power (kW) from a pressure and flow sensor pair, with configurable efficiency
- Both channels can be given a custom name and colour, edited after creation, and removed. Your configuration is saved and automatically restored the next time you open the app with the same sensors connected.

Independent Y-axis per sensor

Each sensor tile (and calc channel tile) in both the devices and live screens now has a Y button. Tapping it gives that sensor its own independent Y axis on the graph, preventing a wide-range sensor (such as temperature) from compressing the graph line of a narrow-range one (such as pressure). The Y button is hidden when only one sensor is connected.

Edit sensor settings from the live screen

Sensor tiles in the live screen can now be tapped to open the sensor settings (name, unit, colour) directly, without having to navigate back to the devices screen.

Improvements

- The Live button is now always visible on the devices screen, greyed out when no sensors are connected, so it's clear the feature exists
- The record button flashes red on the graph screen while a recording is in progress
- After completing sensor setup, the app now automatically connects to the sensor
- Tapping Cancel during a recording now asks for confirmation before discarding the data
- PDF reports now show a place name (e.g. "Birmingham, UK") instead of raw GPS coordinates

Bug fixes

- Pressure values below zero (e.g. -0.5 bar) now display correctly on the graph — previously the graph line would never go below 0
- File export (CSV and PDF) on Android now works correctly across all Android versions
- Sensors with the MD prefix are now recognised and connectable

### 4.2.0 — 2026-03-23

This is a major update, including several must-have new features:

- Flow measurement using Frequency to Bluetooth transmitters
- Multi-Y-axis display, per device
- Power calculation (using pressure and flow readings)
- Alarm threshold and indications
- Auto-record triggering, based on sensor conditions
- PDF test report generation

### 4.0 — 2026-03-04

Improved user experience.

### 2.9 — 2025-11-06

Improved data accuracy.

### 2.5 — 2025-09-08

Improved gauge accuracy.

## Apps similar to Watchlog Bluetooth

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## More apps by Hydrotechnik UK Test Engineering Ltd

- [Watchlog](https://appshunter.io/ios/app/watchlog/id1520386269)
- [SensorLogger Sensor Monitor](https://appshunter.io/ios/app/sensorlogger-sensor-monitor/id6736585953)

All apps by Hydrotechnik UK Test Engineering Ltd: https://appshunter.io/developer/1515531717

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*