BPK vs RRTool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BPK
This utility app measures common mode voltage on motor shafts to assess bearing discharge risk. It can also test the performance of bearing protection solutions, recording and maintaining readings for analysis.
- Measures common mode voltage on motor shafts
- Assesses risk of discharge through motor bearings
- Tests performance of bearing protection solutions
- Records and maintains readings
- Complete kit for testing
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Shaft Voltage Detection Device Helwig Carbon’s Shaft Voltage Detection Device otherwise known as the BPK-Probe™ is an instrument designed to measure common mode voltage on a motor shaft and determine the risk of discharge through the motor bearings. It also has the capability to switch in Helwig’s Bearing Protection solution. This feature allows the user to measure the performance of our grounding device and the risk of further damage to the motor bearings once installed. The BPK-Probe™ comes as part of a complete kit including everything you need to test motor shafts or other devices where damaging discharges may be present. This Mobile App is offered as a solution to record and maintain readings
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: BPK at every 5 weeks against RRTool's every 4 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.
BPK ships an update every 5 weeks, RRTool every 4 months. The most recent releases landed on September 14, 2026 and September 16, 2026 respectively.
| Parameter | BPK | RRTool |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 5 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 37 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Sabhya Technologies LLC | Bay Area Instruments Inc. |
In-app purchases
BPK
No in-app purchases
RRTool
No in-app purchases
