PTBTX2™ vs RRTool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PTBTX2™
This application transforms your iOS device into a precise water quality measurement tool when paired with compatible pocket testers. It offers wireless connectivity, intuitive data recording, and exportable measurement logs for various water quality parameters.
- Wireless communication with pocket testers
- Intuitive GUI for measurements
- On-board database for data storage
- Sortable, filterable, and exportable data
- Automatic calibration records
- Supports multiple water quality parameters
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REQUIRED EQUIPMENT: ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Myron L® Company ULTRAPENX2™ (Second Generation Ultrapen) Models: PTBT1; PTBT2, PTBT3, PTBT4, PTBT5 & PTBT6 INTRODUCTION ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ The PTBTX2™ App is a GUI and communication application that, when paired with one of Myron L® Company's ULTRAPENX2 pocket testers, converts your iOS device into an accurate, reliable, fast and simple to use measurement and data storage device to use in diverse water quality applications. ADVANCED FEATURES INCLUDE: ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ - Wireless communication between the tester and your iOS device means no bothersome wires to interfere with quickly moving from sample to sample and the paired mobile device can be held safely away from the liquid samples being measured. - Intuitive GUI design for easily pairing, calibrating, measuring and recording measurements in the App on-board database. - The database can be sorted, filtered and exported via your devices email App as either .xls; .xlsx, .csv formatted attachments NOTE: The .csv export format may have render certain special characters (such as apostrophes or quotation marks) incorrectly when opened with some spreadsheet applications. - Automatic records made of every calibration performed on each PTBTX2™ pocket tester. WORKS WITH ULTRAPENX2™ POCKET TESTERS ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ULTRAPENX2™ PTBT1 – Measures Conductivity, Total Dissolved Solids (TDS), Salinity, and Temperature. ULTRAPENX2™ PTBT2 – Measures pH and Temperature. ULTRAPENX2™ PTBT3 – Measures Oxidation Reduction Potential (ORP) and Temperature. ULTRAPENX2™ PTBT4 – Measures Free Chlorine Equivalent (FCE) and Temperature. ULTRAPENX2™ PTBT5 – Measures Dissolved Oxygen (Concentration or Saturation) and Temperature. ULTRAPENX2™ PTBT6 – Measures Nitrate Concentration (nitrate or nitrate as nitrogen) and Temperature. The PTBT2 through the PTBT6 Include a sample and hold mode as well as a live measurements mode. Future ULTRAPENX2™ pocket testers will include measurement of Free Chlorine, Dissolved Oxygen and Nitrate. 1. Optimized for iOS 10 or later. 2. When operating on mobile devices running iOS 8 or 9 the PTBTX2™ App but may experience the following performance issues: - Difficulty making and maintaining wireless connections. - Transient on screen messaging errors during some measurements. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Myron L® is a registered trademark of the Myron L® Company, 2450 Impala Drive, Carlsbad CA, 92010-7226 Bluetooth® is a registered trademark of Bluetooth SIG
RRTool
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RRTool is the extended features companion app to your RR1090 digital refractometer and similar Bay Area Instruments devices. It communicates via encrypted BLE with your device, mirroring its buttons and providing extended functionalities such as: cloud spreadsheet logging of your measurements, enabling of ATC for Brix, QR code generation and device firmware upgrades.
Screenshots
Verdict
The clearest difference is update cadence: RRTool at every 4 months against PTBTX2™'s every 15 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PTBTX2™ ships an update every 15 months, RRTool every 4 months. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.
| Parameter | PTBTX2™ | RRTool |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 15 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 17 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Myron L Company | Bay Area Instruments Inc. |
In-app purchases
PTBTX2™
No in-app purchases
RRTool
No in-app purchases









