Work · alternatives · 2026
24 alternatives to FJD Hand Held Refractometer Air
Digital Brix Refractometer, Brix Refractometer, FJDynamics
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. FJD Hand Held Refractometer Air launched in 2022; newer entries below may have overtaken it.
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- 2AL
Hi HN! I’ve been working on an air quality measuring device called Air Lab for the past three years. It measures CO2, temperature, relative humidity, air pollutants (VOC, NOx), and atmospheric pressure. You can log and analyze the data directly on the device — no smartphone or laptop needed. To better show what the device can do and how it feels like, I spent the past week developing a web-based simulator using Emscripten. It runs the stock firmware with most features available except for networking. Check it out and let me know what you think! The firmware will be open-source and available…
2025 · networkedartifacts.com · its alternatives →
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All-in-one sound level meter, dosimeter & frequency analyzer
2024 · its alternatives →
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mectrics▲268Your Mac's vitals in the menu bar. Free and open source.
Jul 2026 · mectrics.app · its alternatives →
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A personal-finance based calorie-counting mobile application
2023 · its alternatives →
- 13
Oral microbiome testing to improve your oral health
2022 · its alternatives →
- 14AS
In the cold season we tend to keep the windows closed. The air gets "stale": humidity often rises above 60 %, which can harm our wellbeing and promote mould. At the same time the CO₂ level in the air increases, which impacts our ability to concentrate. So I built a room air monitor that stays unobtrusive as long as everything is in the green zone, but becomes deliberately noticeable once thresholds are exceeded. For my personal love of statistics I also visualise the measurements in a clear dashboard.
Nov 2025 · nicolin-dora.ch · its alternatives →
- 15OA
This has been a pet project of mine for the past ~5 months. It consists of six visualizations: - Spectrogram: Implements the reassignment method for sharper time and frequency resolution. - Spectrum analyzer: A-weighted, frequency guidelines, loudest frequency tooltip. - Waveform: Colored based on frequency, loudness, or static - Oscilloscope: Tracks pitch and autocorrelates against a reference signal, provides stability. Also includes a regular zero-crossing trigger. - Stereometer & Phase meter: Linear and exponential scaling modes, adjustable windows. Multi-band correlation meter. -…
Mar 2026 · github.com · its alternatives →
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2017 · anfractuosity.com · its alternatives →
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- 18YA
Hi HN, I'm developing an open-source water meter for Home Assistant and thought the HN community might be interested. I've been using some version of it after a few costly toilet leaks that my city meter missed. Recently, I decided to polish it up so others could use it. It might also function as a gas meter reader (https://youtu.be/9Dso4EBAoiE), but this is still experimental. The device runs on 3 AA batteries and utilizes an ESP32-S3. It works by measuring the spinning magnet inside the brass housing. It stays in deep sleep until it needs to transmit usage or leak…
2023 · hackaday.io · its alternatives →
- 19SI
We built a pocket-sized optical breath analyzer based on an optical sensor for measuring CO2 and O2. It streams CPET metrics in real time (VO2, VCO2, VE, RER, Tv etc) for breath-by-breath analysis. Functional prototype based custom PCB, mobile app, and web platform are working. Demo videos: https://youtu.be/-DcvRPJJkj0 https://youtube.com/shorts/Ycy8wP4oW2o?si=W0n1Oyof7M37kdta What’s different Instead of electrochemical O₂ fuel cells and typical CO₂ NDIR modules (slower response, periodic replacement/calibration), we use non-consumable optical sensors…
Oct 2025 · mera.fit · its alternatives →
- 20CT
2019 · honestcoffeeguide.com · its alternatives →
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It is an ideal device for measuring the concentration
2023 · its alternatives →
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The Blue Jay Elite Healthcare Products PERFECT MEASURE WRIST
2022 · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →