You open an app expecting a number. What you actually need, most of the time, is proof: proof the bar next door is too loud after midnight, proof the nursery gets enough daylight, proof the shelf you just hung is actually level. This walkthrough covers the whole path through TrueMeter, from the first tap to the finished PDF, so you know exactly what to expect at each stop.
What You'll Have When You Finish This Walkthrough
In about fifteen minutes you'll have taken a live decibel reading, recorded a timestamped session, compared light levels between two spots, checked a surface for level, and exported a PDF report — all without creating an account or granting a permission you didn't expect.
- An iPhone with TrueMeter installed
- Two minutes in a quiet-ish room, plus access to a second room or spot for the light comparison
- Something loud nearby you can safely record for ten seconds (a vent, traffic, a running tap all work)
- A flat surface to test the level tool on
- TrueMeter Pro if you want to export the PDF at the end — it's a one-time purchase, not a requirement to try everything else
Open TrueMeter and choose your meter
Step 1: Open the app and pick a tool
TrueMeter opens to three clearly separated tools: sound, light, and level & vibration. There's no onboarding to click through and no account to create. Pick whichever one matches what's bothering you right now — for this walkthrough, start with sound.
Get your first decibel reading
Step 2: Take a live reading in two taps
Tap the sound meter, then tap start. The needle moves within a second, showing you a live decibel number that updates continuously. No microphone permission dialog with vague wording — TrueMeter asks once, plainly, and that's the last friction you'll hit.
Step 3: Read the limits before you trust the number
Right on the same screen, TrueMeter states what the reading can and can't tell you: phone microphones aren't calibrated instruments, and results will vary by device model and case. This isn't a disclaimer buried in settings — it's part of the reading itself. If you want the full explanation of why phone mics behave this way, this breakdown covers it in detail.
Record a session while it's happening
Step 4: Start a timestamped recording
Instead of watching a single number and trying to remember it later, tap record. TrueMeter logs the sound level continuously with timestamps, capturing the peaks and the quiet gaps in between. Let it run for the noise event you actually care about, whether that's ten seconds or ten minutes.
Step 5: Stop and review the log
Tap stop and you'll see the session laid out as a timeline, not just an average. This is the difference between saying "it was loud" and showing exactly when it was loud and for how long. If you're building a case around a specific situation, this guide on documenting noise complaints walks through what makes a session actually persuasive.
Point the light meter at two spots and compare
Step 6: Switch to the light meter
Back on the main screen, tap into the light meter. It uses your camera to estimate brightness — point it at a wall, a desk, or a window and you'll get a live lux-style reading. Move to a second spot, take another reading, and now you have an actual comparison instead of a guess about which room is darker.
Set the phone down and check level and vibration
Step 7: Test a flat surface
Switch to level & vibration and set your phone flat on the surface you're checking — a shelf, a picture frame, a floor. The tool needs no camera or microphone access at all, so there's nothing to permit and nothing running in the background. You'll see a live tilt reading and, where relevant, a vibration trace.
Export a report worth handing over
Step 8: Turn your session into a PDF
From a saved sound session, tap export. TrueMeter Pro generates a clean PDF with the timeline, the timestamps, and the stated accuracy limits included — the same honesty from the live screen carries into the document. This is the file you attach to an email to a landlord, a property manager, or a noise complaint form, and it reads like something an adult made, not a screenshot.
Common questions
Does TrueMeter need microphone or camera permission all the time?
No. TrueMeter only accesses the microphone while the sound meter is actively open and recording, and the camera only while the light meter is on screen. The level & vibration tool needs neither. Audio and camera frames are processed live and never stored or transmitted.
Can I record a session without buying Pro?
Yes — the live meters and basic recording work in the free version. Pro unlocks PDF export, extra weightings, alerts, and unlimited history, all through a single one-time purchase rather than a subscription.
How long should a sound session run to be useful?
Long enough to capture the actual pattern, not just the loudest instant. For an intermittent noise like a bar or a barking dog, several minutes across the worst period tells a much clearer story than a ten-second clip.
Why does the app keep mentioning accuracy limits instead of just giving me a number?
Because a phone microphone or camera sensor isn't a calibrated lab instrument, and pretending otherwise would make the reading less useful, not more. Understanding those limits is what makes the number defensible — see how accurate an iPhone's decibel meter really is for the full picture.
What if I want more detail before trying the whole workflow?
The tips article covers smaller adjustments — weighting choices, placement, alert thresholds — worth knowing once you've done this walkthrough once.
This article was drafted with AI assistance and reviewed by a human editor before publishing.