Comparison

PTBTX2™ vs Sentron

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Sentron

Transform your mobile device into a sophisticated pH meter. Connect wirelessly to specialized probes for accurate measurements in various applications. The app guides you through calibration, data logging, and export.

Highlights
  • Wireless pH/EC measurement
  • Bluetooth probe connectivity
  • Step-by-step calibration
  • Data logging and graphing
  • GPS data mapping
  • Automatic temperature compensation
Read full description

Turn your mobile device into a full-featured pH meter by downloading this free Analytical Sensors app. Connect your device to one or more non-glass Sentron pH probes with Bluetooth Low Energy technology. Step-by-step instructions included. The app is intuitive and guides you through the complete process of setting configurations, calibrating, acquiring, storing and exporting all measurement data. Monitoring pH was never that easy! SENTRON EUROPE BV Sentron has developed a comprehensive line of wireless high-quality probes for glass-free pH measurements. Sentron’s ISFET pH sensor technology provides accurate and reliable pH measurements for various applications. All pH probes include a replaceable, interchangeable sensor part for extra durability. It is wirelessly connected via Bluetooth to our Sentron app. Interested? Purchase your pH probe of interest simply at our web shop at www.sentron.nl/shop . For your convenience we offer carry cases with a buffer set and predrill stick. This predrill stick can be used to prepare pilot holes in dry soils. The carry case offers convenient protection for your probes. pH AS A CRITICAL PARAMETER pH is a critical parameter in many areas. Examples include agriculture, horticulture, environment, laboratory applications and inline food processes for beer, wine, meat, fish, or cheese. SENTRON’S ISFET pH SENSOR PROBE * Wireless * Glass-free * Robust * Dry storage SENTRON GLASS-FREE pH PROBES Thanks to comprehensive ISFET pH sensor technology, Sentron offers glass-free wireless pH probes. The probes are used for accurate and reliable pH measurements for demanding applications. Multiple Sentron probes can be connected simultaneously. Functions include calibration (1-, 2-, 3- and 5-point calibration), sample measurement, data logging, graph plotting and data sharing. Measurement of pH and temperature starts as soon as the probe is connected to the mobile device. A notification signals when a probe needs a new calibration. The measurement can be displayed as tabulated data or a graph. ADDITIONAL FEATURES * Display of the probe’s condition, name, reading stability and battery life * Both automatic customizable and manual data logging * Automatic temperature compensation (ATC) * User-definable alarm thresholds for pH and temperature * Automatic recognition of previously connected probes and calibration data stored on probes * GPS mapping of your pH data * Advanced mode option for expert users WIRELESS The Sentron probe’s Bluetooth Low Energy technology offers many advantages in wireless measurement convenience. Each probe can be used up to 50 meters (150 feet) from the mobile device. The Sentron probe and app are ideal for professionals and private indiiduals that need accurate wireless measurements in the laboratory, industry halls, outdoors, etc. Sentron probes are compatible with devices with Bluetooth 5.0 or higher. DEMO PROBES AVAILABLE Would you like to experience our app before buying our product? That’s possible! Download the app and add the virtual demo probe in the app. Experience the convenience of the app yourself. COMING SOON: MULTIPARAMETER PROBE The current pH probe portfolio will be extended with probes for EC (Electrical Conductivity) and ORP (Oxidation Reduction Potential). Imagine: alle these parameters in one and the same probe! Follow us at www.sentron.nl for any related news.

Screenshots

PTBTX2™4 screens
Sentron4 screens

Verdict

The call

The clearest difference is rating: PTBTX2™ at 5.0 against Sentron's 3.0. PTBTX2™ also leads on iOS requirement (13.0 vs 15.0). Sentron's advantage is update cadence (every 5 weeks vs every 15 months). On price, ratings volume, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

PTBTX2™ holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

PTBTX2™ ships an update every 15 months, Sentron every 5 weeks. The most recent releases landed on September 29, 2026 and October 8, 2026 respectively.

Scorecard3 real differences · 6 level
PTBTX2™ versus Sentron: the parameters behind the verdict, then further details
ParameterPTBTX2™Sentron
PriceFreeFree
Rating5.0 (1 ratings) — better3.0 (2 ratings)
Number of ratings12 — better
Update frequencyEvery 15 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.0 — better15.0
Further details — not scored
Size17 MB94 MB
Age rating4+4+
DeveloperMyron L CompanySentron Europe B.V.

Customer experience

PTBTX2™

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Sentron

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

PTBTX2™

No in-app purchases

None

Sentron

No in-app purchases

Questions

Is PTBTX2™ free?
PTBTX2™ is free to download, with no in-app purchases.
Is Sentron free?
Sentron is free to download, with no in-app purchases.
Which has better reviews, PTBTX2™ or Sentron?
PTBTX2™ is rated higher. PTBTX2™ averages 5.0 out of 5 from 1 ratings, while Sentron averages 3.0 from 2 ratings.
Do PTBTX2™ or Sentron have ads?
Neither PTBTX2™ nor Sentron shows ads.
Which is updated more often, PTBTX2™ or Sentron?
PTBTX2™ ships an update every 15 months, and Sentron every 5 weeks. Most recently, PTBTX2™ was updated on September 29, 2026 and Sentron on October 8, 2026.

Other comparisons