# UEi DTHA2 vs MRLDS 400

The clearest difference is iOS requirement: UEi DTHA2 at 12.0 against MRLDS 400's 14.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UEi DTHA2 ships an update every 7 months, MRLDS 400 every 5 months. The most recent releases landed on October 24, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | UEi DTHA2 | MRLDS 400 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/uei-dtha2/id1452986649/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 months** |
| Monetization | Free | — |
| Size | 17 MB | 8 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kane Asia Inc.](https://appshunter.io/developer/1542732944) | [Copeland LP](https://appshunter.io/developer/464252882) |

## What reviewers say

### UEi DTHA2

[App page](https://appshunter.io/ios/app/uei-dtha2/id1452986649)

This app connects to a wireless adapter to measure airflow velocity, volumetric flow, temperature, and relative humidity. It allows adjustments for ducting and offers averaging options for readings.

**Highlights:** Measure airflow velocity, Measure volumetric flow, Measure temperature, Measure relative humidity, Adjust for ducting, Time or point averaging

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

**In-app purchases:** none


### MRLDS 400

[App page](https://appshunter.io/ios/app/mrlds-400/id1502566407)

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

**In-app purchases:** none


## Frequently asked questions

### Is UEi DTHA2 free?

UEi DTHA2 is free to download, with no in-app purchases.

### Is MRLDS 400 free?

MRLDS 400 is free to download, with no in-app purchases.

### Do UEi DTHA2 or MRLDS 400 have ads?

Neither UEi DTHA2 nor MRLDS 400 shows ads.

### Which is updated more often, UEi DTHA2 or MRLDS 400?

UEi DTHA2 ships an update every 7 months, and MRLDS 400 every 5 months. Most recently, UEi DTHA2 was updated on October 24, 2026 and MRLDS 400 on September 28, 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.*