# 注册计量师真题库 vs Sensor Recorder Pro

The clearest difference is in-app purchases: 注册计量师真题库 at none against Sensor Recorder Pro's 1. 注册计量师真题库 also leads on iOS requirement (13.0 vs 15.4). Sensor Recorder Pro's advantage is update cadence (every 4 weeks vs every 12 months). On price, ads and device support there is nothing between them.

Both are free to download. Sensor Recorder Pro sells 1 one-off in-app purchase. 注册计量师真题库 asks for nothing beyond the download.

注册计量师真题库 ships an update every 12 months, Sensor Recorder Pro every 4 weeks. The most recent releases landed on September 7, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | 注册计量师真题库 | Sensor Recorder Pro |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 3 MB |
| Requires iOS | **13.0** | 15.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [将军 黄](https://appshunter.io/developer/1745234400) | [晓聪 姜](https://appshunter.io/developer/6782490208) |

## What reviewers say

### 注册计量师真题库

[App page](https://appshunter.io/ios/app/2025/id6738836183)

This app provides practice questions and mock exams for the Registered Metrologist qualification exam. It covers exam syllabi and official textbooks, offering daily exercises, topic-specific practice, and simulated test environments to help candidates prepare effectively.

**Highlights:** Daily practice tests, Topic-specific exercises, Past exam papers, Mock exam simulations, Exam syllabus coverage

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Sensor Recorder Pro

[App page](https://appshunter.io/ios/app/sensor-recorder-pro/id6782758613)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Recording | $2.99 | one-time |


## Frequently asked questions

### Is 注册计量师真题库 free?

注册计量师真题库 is free to download, with no in-app purchases.

### Is Sensor Recorder Pro free?

Sensor Recorder Pro is free to download, with in-app purchases available.

### Do 注册计量师真题库 or Sensor Recorder Pro have ads?

Neither 注册计量师真题库 nor Sensor Recorder Pro shows ads.

### Which is updated more often, 注册计量师真题库 or Sensor Recorder Pro?

注册计量师真题库 ships an update every 12 months, and Sensor Recorder Pro every 4 weeks. Most recently, 注册计量师真题库 was updated on September 7, 2026 and Sensor Recorder Pro on September 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*