Feelfit scale link
offlineStep on the scale, then tap Pair. The link is remembered and re-arms itself automatically.
If no data arrives
- 1. Wake the platform. Step on the scale so its display lights up — the radio only advertises while the load cells are active.
- 2. Force-close the vendor app. If the official scale app is running it holds the Bluetooth link. Swipe it away, then tap Re-pair.
- 3. Stay within a metre of the platform while the mass settles, and keep the screen on until the capture line appears.
MANUAL / FEELFIT APP ENTRY
If the browser has no Bluetooth access, read the two numbers off the Feelfit app and type them here. Impedance is optional — without it the engine falls back to anthropometric estimation and says so.
Checking account…
Sharing these with a doctor? Build a clinician report — picked readings, where each came from, the formula behind every figure, and quality checks.
AI scale insights are switched off
Turning it on lets this page send a de-identified summary of your trend statistics — channel names, latest values, baselines and slopes — for interpretation, and returns a written review. Raw dated readings are not included; an optional question is sent as written.
Open permissionsLive capture
no scale—.——
kgimpedance pendingNo scale is linked yet.
Pair your scale in the panel above; live frames appear here once it is linked.
Frame map
No vendor packet captured yet. Step onto the scale with the link open — the raw frame is stored with every weigh-in and decoded here.
Anthropometry
Height, age and sex are non-negotiable inputs to the Kyle and Kushner equations — the resistance index is H²/R. Getting height wrong by 2 cm moves fat-free mass by roughly 0.6 kg.
Compare with your scale app
Waiting for a reading from both apps.
Nothing shared yet. Two apps cannot hold the same Bluetooth link at once, so readings are shared through the phone's health store instead: open the relay app, grant it read and write access to health data, and let the FeelFit app save one weigh-in. Its numbers then appear here next to ours.
Type in what the other app shows
Stand on the scale with both apps open and copy its numbers here to compare straight away, without waiting for the phone's health store.
Match the scale exactly
built-inThe CS20G firmware-49 layout is already built in — weight from bytes 3-4, high byte first, in 10 g steps, checked against the packet's own checksum. You only need this if your scale reports a different number to the app.
To pin a different scale: copy the raw packet from the frame map above and type the weight its own screen showed.
Set the numbers myself
For when you already know your scale's layout. The preview decodes your most recent packet with these settings, so you can check it before saving.
No packet captured yet — save anyway if you are sure.
Correct your weight
no correctionThe reading is decoded exactly as the scale sends it, but a scale can still sit a little low or high — carpet, an uneven floor, or a drifted zero. Tell the app your real weight once and it corrects every reading from this app from now on, including after it reconnects or the app is reopened.
Measurement history
No stored measurements yet. Weigh-ins are kept on this device, and on your account once sync is allowed. Sign in to also review measurements stored on your account.
Weight
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over 30d — · range —–—
vs previous 30d: —
Body fat
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over 30d — · range —–—
vs previous 30d: —
Muscle
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over 30d — · range —–—
vs previous 30d: —
Body water
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over 30d — · range —–—
vs previous 30d: —
BMI
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over 30d — · range —–—
vs previous 30d: —
Guided capture
not armedArm a capture when you are ready to weigh yourself.
Session timeline
Nothing recorded yet. Connect the scale and each step of the exchange appears here.
Developer diagnostics
Nothing recorded for this session yet. Connect the scale and step on — every packet, reply and decoded value appears here.
Export diagnostic report
Everything from this session in one file: connection and handshake events with their raw packets and timestamps, the guided capture with scale-sent versus shown weight, the saved correction and your decoded readings.
- Timeline events
- 0
- Readings
- 0
- Capture
- none
- Report lines
- 12
Reports are built on this device and never uploaded. Timestamps are UTC so a capture can be compared against a Bluetooth log line by line.
How your weight and body figures are produced
The full path from Bluetooth packet to the numbers on this page, with the arithmetic and its sources.
What this does that nothing else does
- Wrist signals indexed to measured lean mass. Watches index to body mass or to nothing. Cardiac output tracks fat-free mass, so every heart-rate-derived number here is divided by tissue the scale actually measured.
- Impedance re-derived, never inherited. The scale's proprietary percentages are discarded; mass and ohms go into published equations so the maths is auditable and consistent across devices.
- Fluid-shift correction on the wearable. A TBW/FFM ratio above the 73.2% constant flags extracellular expansion, so a "bad HRV day" is separated from a water-loading artefact — the same distinction NASA's unloading work depends on.
- Partition-aware advice. Weight loss is judged by whether lean or fat mass is falling faster, then cross-read against the watch's autonomic and energy channels.