# ORP Basic for Jenco ORP650B vs Guardian Call

The clearest difference is update cadence: Guardian Call at every 4 months against ORP Basic for Jenco ORP650B's every 15 months. ORP Basic for Jenco ORP650B's advantage is device support (3 vs 1) and iOS requirement (9.0 vs 17.0). On price, 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.

ORP Basic for Jenco ORP650B ships an update every 15 months, Guardian Call every 4 months. The most recent releases landed on October 13, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | ORP Basic for Jenco ORP650B | Guardian Call |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/orp-basic-for-jenco-orp650b/id1315381470/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 19 MB | 6 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jenco Instruments, Inc.](https://appshunter.io/developer/1275832649) | [DSIRF GmbH](https://appshunter.io/developer/1494925585) |

## What reviewers say

### ORP Basic for Jenco ORP650B

[App page](https://appshunter.io/ios/app/orp-basic-for-jenco-orp650b/id1315381470)

This app pairs with a Jenco ORP Bluetooth tester to provide accurate ORP and temperature readings. It offers guided calibration, a clear display of measurements, and useful features like calibration reminders and battery life indicators.

**Highlights:** Accurate ORP and temperature measurement, Bluetooth pairing with Jenco tester, Guided calibration procedures, Reading quality indicator, Displays tester battery life, Pause readings (Hold)

**Features:** macOS Compatibility

**In-app purchases:** none


### Guardian Call

[App page](https://appshunter.io/ios/app/guardian-call/id6449091355)

**In-app purchases:** none


## Frequently asked questions

### Is ORP Basic for Jenco ORP650B free?

ORP Basic for Jenco ORP650B is free to download, with no in-app purchases.

### Is Guardian Call free?

Guardian Call is free to download, with no in-app purchases.

### Do ORP Basic for Jenco ORP650B or Guardian Call have ads?

Neither ORP Basic for Jenco ORP650B nor Guardian Call shows ads.

### Which is updated more often, ORP Basic for Jenco ORP650B or Guardian Call?

ORP Basic for Jenco ORP650B ships an update every 15 months, and Guardian Call every 4 months. Most recently, ORP Basic for Jenco ORP650B was updated on October 13, 2026 and Guardian Call on September 29, 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.*