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Bluetooth multimeter app · iPhone & Android · Works offline

Every point, in order. One clean record.

TestNMeasure turns your Bluetooth multimeter into a guided test. Define the points once, capture each reading with one tap (or none, with auto-capture), see pass or fail on the spot, and finish with an Excel or PDF report.

Launching with OWON OW18B and OW18E · any other meter by hand · See supported meters →

iOS and Android, beta this winter.

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  • 50points, in order
  • 1tap per point (or none)
  • 0re-keying into Excel

Free, and good at it

A proper meter app first.

Open it next to your OWON and you get a better daily driver than the stock app: a big readout that shows which digits have settled, a live graph one swipe away, hold, min/max/avg, rolling averages, REL for your test leads, and one-tap capture with a note, photo or voice memo. Export any session as CSV. No account needed.

  • Honest readout

    Settled digits bright, changing digits dim. Nothing smoothed, nothing rounded. OL shows as OL.

  • Number ↔ graph

    Swipe the readout for a live graph. Pinch to zoom, tap the trace for a value.

  • Hold · Min · Max · Avg

    Freeze the display without touching the meter. Stats reset when the function changes, not when it autoranges.

  • Rolling averages

    5, 30 and 60 second averages that pause when you lift the probes.

  • REL and scaling

    Zero out lead resistance, or scale a clamp adapter or shunt with your own factor. The raw reading is always kept.

  • Capture with context

    One tap saves the reading. Add a label, a note, up to five photos or a voice memo.

  • Logs and time series

    Record every reading, or one every 1, 5 or 60 seconds, even with the screen locked. Auto-record when the value is steady.

  • Quick CSV

    Any session or test file to CSV, including semicolon and tab-delimited variants.

  • Demo meter

    No meter yet? The built-in demo meter runs every feature.

Free: everything above, with no time limit and no account. Pro adds the sequence recorder, custom formulas, Excel and PDF reports, sync and the web app.

The job nobody built a tool for

You measure the same 50 points, in the same order, every time. Then you re-key it all into Excel by hand.

  1. 01

    A clipboard in one hand, a meter in the other. Skip a row and a value lands on the wrong line.

  2. 02

    Photos for evidence end up loose in the camera roll, detached from the reading they prove.

  3. 03

    An evening of re-typing into a spreadsheet, and transcription errors creep in.

  4. 04

    An out-of-spec value? You often spot it while re-keying, too late to re-measure on site.

The sequence recorder Pro

Turn your procedure into a guided test.

Define the points once as a template. Run it live: the app shows the next point, takes the reading when it's steady, checks it against your limits and moves on. Finish with one clean test file.

Step 01: Build it once

List your points in order, grouped the way your drawing is: Cable 1, Cable 2, J3. Paste a 500-row pin table from Excel, or generate labels like J1-A → J14-A and skip I, O and Q. Set the expected function and pass/fail limits per step, or measure one step across 25 identical pins. Templates are versioned, so an old record never changes meaning.

Step 02: Capture and advance, or let it capture itself

Turn on auto-capture, touch the pin and hold still. The reading is taken the moment it's stable, and anti-jitter is built in: a value flickering between 27.8 and 27.9 records as one steady reading. Lift the probes and the next point is armed. Pass or fail shows instantly. Redo a pin later and every attempt is kept.

  • Instant pass/fail. Green or red with the reason ("above max 0.5 Ω") the moment you capture.
  • Hands-free capture. Stable readings capture themselves; lifting the probes arms the next point. Or capture when you press HOLD on the meter.
  • Forward, back, recheck. Jump to any point from the rail; failed points are one tap away.
  • OL and UL aware. Over-range is recorded as OL, never as a number.
  • Wrong function? It tells you. "Meter on AC V, step expects DC V" before you capture.
  • Typed values and check steps. Enter a value by hand or tick "Backshell torqued" in the same run.
  • Nothing lost. Every capture is saved before the tick. A crash, a dead battery or a phone call and you resume at the same step.

Step 03: One clean record

Finish and the run becomes a test file: every value, every pass and fail, every note and photo, with a summary on top. Export it, share it, or tap Start next unit to run the same template on the next serial number.

Built around a 500-point job

An aviation harness technician checks every cable three times: after lead-out, after the connectors go on, and again in the aircraft before power-on. A connector can carry 129 pins, a job is about 500 results, and there's no internet on the hangar floor. He asked for three things: a preloaded connector file, forward/back/recheck, and a steady reading instead of a flickering one.

"It would save 6 hours every week."

from an aviation harness technician's requirements, 2015–16

The run loop is designed for that job: pin tables with headers, auto-capture per pin, one hand on the probes, fully offline.

Start from a template:

  • Connector continuity
  • Harness pin table
  • 12 V battery & charging
  • Li-ion pack cells
  • PCB power-rail bring-up
  • 3-phase motor windings
  • Mains outlet check
  • Solar panel quick check
  • Quick 10-point log

Free users can import a shared template and try the sequence recorder on their first test runs.

Calculator · presets free · formulas Pro

A calculator that knows your measurements.

Measure 1.5 V across a resistor, switch to Ω and measure 10 Ω, then open Calc: Ohm's law is already filled in, 150 mA and 225 mW. Presets for power, dividers, series and parallel, LED resistors, RC, dB and deviation are free. With Pro, write your own formulas and put them inside templates: the drop between two pins, the average across 25 channels, the deviation from nominal. They calculate live, per capture or when the run finishes.

step("Pin14") − step("Pin13")
step("V") × step("I")
avg(ch("Pins 16–40", 1..25))
(live − nominal("Rail 3V3")) / nominal("Rail 3V3") × 100

Reports and sharing

Walk away with a record, not a photo of a notebook.

Finish a run and export an Excel report laid out the way you'd build it by hand: a header block, one row per point, real numbers, PASS/FAIL cells and a summary. Or export a PDF with your company header, notes, photos and a sign-off block. CSV is free for everything. Everything leaves through your phone's normal share sheet: mail, Teams, Drive, AirDrop, Nearby Share, Files.

Share the procedure, not just the result. Send a template as a .tnmt file and a colleague can import it and run it, free. Send a whole test file as .tnmr, with every reading, attempt and photo, and it opens read-only in their app.

  • .xlsx report Pro
  • PDF report Pro
  • .csv
  • .tnmt template
  • .tnmr test file
  • Share sheet

ComingA tamper-evident fingerprint and a signed timestamp on every report, a drawn signature at finish, and your own export columns.

Meters

OWON first. Your meter next.

TestNMeasure launches with live Bluetooth support for the OWON OW18B and OW18E. Any other instrument (clamp meter, thermometer, insulation tester, gas detector) works on day one: type its value into the same step and the report marks it as manual. Live support is added one meter at a time, and only after it has been tested on real hardware.

  • OWON OW18B

    Launch target

  • OWON OW18E

    Launch target

  • Other OWON BDM-series meters

    Same protocol · not yet verified

  • Any instrument

    Manual entry

  • No meter

    Built-in demo meter

Your instrument list remembers every meter by name, battery and firmware. One live meter at a time.

ComingPress the meter's buttons from your phone, download its own memory, and "Request my meter", which sends us your meter's Bluetooth fingerprint so we can add it.

Which meter do you use? Mail its make and model to support@testnmeasure.app; that's how we choose the next one. All supported meters →

Offline on site · the web at your desk Pro

Capture on your phone. Work the data on the web.

Everything on the phone works with no signal: underground, behind shielding, on a hangar floor where phones stay offline. Back at your desk, your test files, logs and templates sync to the web app. Search your records, fix a typo as a new revision (the original is kept), build long templates in a spreadsheet-style grid with paste from Excel, and export.

  • iPhone, Android and web on one account. Mix platforms freely.
  • No passwords. Sign in with Apple, Google or a code sent to your email.
  • Your data, your call. Exporting all your data and deleting your account are free, always.
  • The web app doesn't connect to meters. Capture happens on the phone.

Who it's for

Built for the person whose name is on the record.

The independent bench tech, the commissioning engineer, the repair specialist: anyone who runs the same ordered measurements again and again and needs the result to be right. No IT project, no rollout. Open it and run your test.

Makers, students and tinkerers: the free meter app is for you too.

Note: Teams, shared template libraries and reviewer sign-off are on the roadmap. v1 is built for one person working alone.

  • Connector and harness continuity
  • Board bring-up and QA
  • EV and battery-pack testing
  • Panel and system commissioning
  • Periodic inspection and calibration runs
  • Field service where there's no signal
The original Voltset hardware and Android app: two phones showing the cyan ring dial, next to the mini-VOLTSET and MEGA-VOLTSET meter boards.

Heritage

Since 2013: from Voltset to TestNMeasure.

We started in 2013 by building our own connected multimeter, Voltset, with a phone app built around a ring-shaped dial. The colours on this page (the red, the charcoal, the two blues and the yellow) come from its 2014 identity, unchanged.

Building safe, certifiable meter hardware turned out to be much harder than building the software. What lasted was what technicians kept telling us: the meter isn't the problem. The clipboard is.

So TestNMeasure is software only, for Bluetooth meters you can already buy. Same ring, same palette, many more conversations with the people who use it. One app to bind them all.

2014 · Voltset dial
2026 · TestNMeasure ring
  1. 2013First prototype: a phone becomes a voltmeter.
  2. 2014The Voltset identity and the ring-dial app.
  3. 2015–16An aviation harness technician describes the sequence recorder.
  4. 2020Work starts on OWON BDM-series Bluetooth meters.
  5. 2026TestNMeasure, native on iPhone and Android.

Free and Pro

Free for the meter. Pro for the procedure.

Free

Everything you need every day

  • Live readout, graph, hold, min/max/avg, rolling averages, REL
  • Capture with notes, photos and voice memos; logs and time series
  • CSV export of everything
  • Demo meter and manual entry for any instrument
  • Calculator presets and Ohm's-law auto-fill
  • Import, run* and share templates and test files
  • Optional account; export or delete your data any time

Pro

For work that ends in a report

  • Build and edit templates: groups, pin-table import, multi-channel steps, limits, versions
  • Unlimited test runs with auto-capture, pass/fail, redo and resume
  • Custom formulas, inside templates and live under the readout
  • Excel and PDF reports with your company header
  • Sync across iPhone, Android and the web app

Pro is an in-app upgrade on the App Store and Google Play. You'll see the price in the app before you decide.

* Try the sequence recorder on your first test runs before you upgrade.

Your data is never held hostage. If Pro lapses you can still open every record and export it as CSV.

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FAQ

Which multimeters does TestNMeasure work with?

At launch, live Bluetooth support is for the OWON OW18B and OW18E. Other OWON BDM-series meters use the same protocol and may work, but we list a meter as supported only after testing it on real hardware. Any other instrument can be used by typing its readings into the app. See the supported meters page.

Does it work offline?

Yes. Connecting to the meter, capturing, templates, test runs, the calculator and every export work without a network. You only need a connection to sign in, sync, use the web app or make a purchase.

Is it available for iPhone and Android?

Both, as native apps with the same features, planned for iOS 17 or later and Android 8.0 or later. The web app is for reviewing and exporting records and building templates; it doesn't connect to meters.

Do I need an account?

No. Every free feature works without one. An account (Sign in with Apple, Google or an emailed code) is only needed for sync, the web app and using Pro across devices.

What happens to my measurement data?

It stays on your phone unless you turn on sync. With sync, it's stored encrypted on our servers in the EU and is never sold or used for advertising. The app's optional usage statistics never include reading values, names, notes, photos or locations, and you can turn them off. Details are in the privacy policy.

Which export formats are there?

CSV for everything, free (including semicolon and tab-delimited variants). Excel (.xlsx) and PDF test reports with Pro. Templates and complete test files can be shared as .tnmt and .tnmr files between TestNMeasure users.

Can I try it without a meter?

Yes. The built-in demo meter behaves like a real one, including a 50-pin harness scenario, so you can try capture, test runs and exports first.

How much does Pro cost?

Pro is an in-app upgrade on the App Store and Google Play, and the app shows the price in your currency before you buy. The free meter app stays free.

Is TestNMeasure made by OWON?

No. TestNMeasure is made by Blaris ApS in Denmark and is not affiliated with or endorsed by OWON. OWON is a trademark of its owner.

Can I use it for mains or high-voltage work?

TestNMeasure only reads what your meter measures; it doesn't change how the meter works. Use a meter and leads rated for the job, and follow your local safety rules. You set the pass/fail limits; a test file is your record, not a certification.

Coming to iPhone and Android.

iOS and Android, beta this winter.

Questions or a meter to suggest? Mail support@testnmeasure.app.

No tracking cookies, no ad networks, no sign-up.