Equip your experiments

Tracks sleep stages, HRV, resting heart rate, skin temperature, and produces a daily Readiness score. Used in multiple published studies. Ring form factor means higher comfort and compliance than wrist devices.

Subscription-based wearable focused on training load (Strain) and recovery. No screen keeps you off your phone. Useful for correlating workout intensity with next-day HRV and sleep quality.

Full GPS running and cycling watch that tracks HRV Status (7-day trend), Body Battery, sleep, and training readiness. The HRV Status feature is one of the better consumer implementations for week-to-week trend tracking.

Garmin's flagship adventure watch with solar charging, ECG-validated HRV, full GPS multi-band, pulse oximeter, and ground contact time for running mechanics. The training load and recovery time features make it ideal for structured exercise experiments.

At 30g, the Pace 3 is one of the lightest GPS sport watches available. COROS's HRV tracking and training load analysis rival Garmin at a lower price. Outstanding battery life means fewer charging interruptions in multi-week experiments.

60-day battery in smartwatch mode, dual-frequency GPS, and advanced training analytics. The COROS EvoLab suite tracks VO2 max trends, training load, and recovery — making it one of the most data-rich platforms for long-running experiments.

The best choice if you're in the Apple ecosystem. ECG on demand, blood oxygen, crash detection, and the widest app support. Sleep tracking is less detailed than Oura or Garmin for stage detection, but works well as an all-purpose baseline device.

The reference device used in research studies measuring HRV. ECG-level accuracy. If you want to know your actual HRV rather than an estimate, pair it with Elite HRV or HRV4Training.

Polar's flagship watch includes a wrist ECG for on-demand HRV measurement, optical heart rate, running power, and advanced sleep tracking. Polar's sleep staging algorithm is among the more accurate consumer implementations.

The top choice for Android users. Measures body composition (BIA), tracks sleep including sleep coaching, ECG, and blood pressure (in supported countries). Google Health integration makes data export and correlation straightforward.

Measures weight, BMI, body fat %, muscle mass, bone mass, and water percentage via bioelectrical impedance. Syncs to Apple Health and Google Fit. Ideal for tracking changes during diet or exercise experiments.

Slides under your mattress and tracks sleep cycles, heart rate, and snoring via pressure and sound sensors. No wrist device needed — excellent for multi-night experiments where compliance matters.

Tune colour temperature from warm (2200K, pre-sleep) to daylight (6500K, morning). Run controlled experiments on how light temperature affects your sleep onset and morning alertness.

Smart bed base with SleepTracker-AI that monitors sleep without a wearable. Adjust head/foot elevation and track whether posture changes affect sleep quality or back pain over time.

A reliable 11 lb / 5 kg kitchen scale with 1g precision and a large platform. Consistent weighing is the foundation of any food experiment — replacing volume measures with weight makes recipes reproducible.

The Thermapen One reads in 1 second to ±0.5°F/0.3°C. Essential for food science experiments: testing doneness, fermentation temperatures, and oil temperature for frying.

The most powerful tool for personalized nutrition experiments. Wear a CGM for 10-day periods to measure how different foods, meal timing, and exercise affect your blood glucose. Requires a prescription in most countries.

A proper fermentation crock with a water seal creates the anaerobic environment needed for consistent lacto-fermentation. Run controlled trials comparing fermented vs. unfermented foods for digestive markers.

A low-cost Bluetooth sensor that pushes into soil and measures moisture, conductivity (nutrients), sunlight, and temperature every hour. Compare watering schedules, soil mixes, or pot locations side by side.

Measures pH and total dissolved solids (TDS) in water or soil runoff. Essential for hydroponic and fertigation experiments where nutrient concentration and pH directly control plant uptake.

A small Bluetooth/WiFi logger that records temperature and humidity with graphed history in the Govee app. Compare microclimate conditions across different spots in your garden, greenhouse, or grow tent.

Samsung LM301H diodes and a dimmer make this a suitable controlled light source for indoor experiments — you can hold light quality constant and vary only the factor you're testing (watering, soil, etc.).

Measures brainwaves (EEG), heart rate, breathing, and body movement during meditation sessions. Translates brain activity into audio feedback — calmer brain = quieter weather sounds. Useful for tracking session quality over time.

A desk riser that lets you switch between sitting and standing without replacing your desk. Run structured experiments: alternate sitting days vs. standing days and track energy, focus, and back pain as outcomes.

Excellent active noise cancellation lets you hold the acoustic environment constant across sessions. Test how music genres, white noise, or silence affect deep work output by changing only that one variable.

A visual countdown timer that shows exactly how much time remains with a disappearing red disc. Ideal for comparing work-block lengths — 25 min vs. 45 min vs. 90 min — and measuring their effect on output quality.

Clinically validated upper-arm cuff with Wi-Fi sync. Measures systolic/diastolic pressure and heart rate. Run controlled experiments on diet, salt intake, exercise, or stress management protocols.

A ring-style oximeter that tracks SpO2 and heart rate all night, vibrating if oxygen drops below your threshold. Useful for testing sleep interventions in people with mild sleep apnea or for altitude experiments.

The most accessible entry point for wrist-based tracking. Steps, active minutes, sleep, HRV (limited), and stress. Good enough to detect meaningful differences between experimental conditions even if absolute values have noise.

A numbered, indexed hardback notebook. Some outcomes — mood, cognitive quality, subjective energy — are best captured with a few written lines rather than a slider. Combine with digital tracking for the full picture.