# 121GW Companion — Bluetooth meter companion

> Bluetooth meter companion (iPhone/iPad app by dominique wiener.)

- Source: https://appshunter.io/ios/app/121gw-companion/id6833369656 (this page in markdown: same URL + `.md`)
- Developer: [dominique wiener](https://appshunter.io/developer/6833369658)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-11-11
- Data updated: 2026-11-14

## What is 121GW Companion?

121GW Companion connects your 121GW multimeter to your iPhone over Bluetooth.

- Live: the reading drawn like the meter's display, with its symbols and bargraph; statistics (min, max, mean, standard deviation); derived values (REL, 4-20 mA loop, Pt100 / Pt1000 temperature, limit test); the meter's keys from the phone.
- Scope: up to 6000 readings on a scope grid, time base 10 s to 10 min, stop / run and two cursors.
- Log: record every reading to a CSV file and share it.
- Voice notes: while recording, say what you are measuring; your words are recognised on the iPhone and written into the recording next to the readings. No audio is kept.
- Card: list, download and manage the files on the meter's SD card.
- Meter: firmware and bootloader updates over Bluetooth, the meter's settings, clock sync and a diagnosis report.

Made for the open firmware of the 121GW: github.com/zombu4/121GW-Open-Firmware

Free: no account, no ads, no in-app purchases, no data collected.

Turn Bluetooth on at the meter with a long press of PEAK.

## Is 121GW Companion safe?

Not enough ratings yet to assess 121GW Companion.

## Is 121GW Companion legit?

121GW Companion has limited verification signals. The AppsHunter Legitimacy Score for 121GW Companion is 50 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-11-14

Voice notes: while you record, say what you are measuring. Your words are recognised on your iPhone and written into the recording next to the readings, in the row where you began speaking. No audio is kept and nothing leaves the phone. Switch it on in the Log page.

### 1.0 — 2026-11-11

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-14.*