01
Reader
A compact handheld electrochemical reader.
- Pocket-sized and rugged
- Reads every NS2 strip
- Pairs with the app
- Electrochemical measurement, lab-grade results
- Battery-powered for use in the field
Technology
One toolbox for nitrogen
Electrochemical sensing brings lab-grade precision to a handheld format.
02
Strips
Single-use sensing strips, one per analyte. One drop is enough.
- Nitrite, nitrate and ammonium
- Freshwater and Marine variants
- A single drop per test
- Pre-calibrated, no reagents to mix
- Individually sealed pouches
03
App
Results, history and export on your phone.
- Guided measurement
- Sample history and notes
- Export for reporting
- Results logged by sample and site
- Connects to the reader via Bluetooth
01 · The reader
A reader that fits where your hand does
The reader is the other half of the test. The cartridge slides into one end; the reader powers it, reads the current it produces and sends a clear number to your phone over Bluetooth. There is no screen to learn — your phone is the display. No bench, no reagents, no calibration step.
- Format
- Handheld, about the weight of a phone
- Sample
- One drop of water, 50–70 µL
- Sample preparation
- None
- Time to result
- 3.5 minutes
- Nitrite range
- 0.025–5 mg/L (as N)
- Calibration
- Pre-calibrated strips (QR code)
- Display
- None on the device — results appear on your phone
- Connectivity
- Bluetooth sync to the smartphone app (iOS, Android)
02 · The cartridges
One sealed cartridge, one test
Each cartridge is a single-use electrochemical sensor strip, sealed in a foil pouch and pre-calibrated for the reader. Open, insert, add one drop.
- Packaging
- 1 single-use strip per individually sealed pouch
- Sample
- One drop, 50–70 µL
- Calibration
- Pre-calibrated (QR code)
- Storage
- Recommended storage: 2–8 °C. Keep dry, away from direct sunlight.
- Strip shelf life and storage
- Unopened: 6 months. After the pouch is opened: 1 hour.
- Accuracy & Precision
- Nitrite range 0.025–5 mg/L (as N)
03 · The app
Convenient and affordable
The NS2 app pairs with the reader to capture each result with time and location, sync it to your account, and share data through an open API. Available for iOS and Android.
- One drop of water is enough — no sample prep, no reagents to mix and no standards to run.
- A lab-grade nitrite result in 3.5 minutes, where the water is.
- Every reading is time-stamped and saved in the NS2 app, ready to export.
- Minimal training: insert a strip, add a drop, read the result.
The science behind the sensor
Biology for specificity, electrochemistry for speed
Specific by design
An enzyme layer reacts only with nitrite, even in salty or murky water.
Patent protected
European patent granted · US patent pending.
Turbidity-free
We measure an electric current, not a color, so cloudy water doesn't distort results.
Pre-calibrated
Each strip carries its own calibration (QR code). No standards, no setup.
Precedented
Enzyme-based methods already have regulatory standing.
Labs, sensors and NS2: three roles
Three roles, one picture
NS2 works alongside certified labs and online sensors, not against them. Most well-run water systems need all three.
Certified labs
The certified record
Best for: Compliance reporting, baselines, full nutrient panels.
Limits: Results take days, and budgets allow few samples.
NS2 on site
The fast, specific answer
Best for: Daily checks, the gaps between lab samples, checking sensors, choosing which samples to send to the lab.
Limits: Spot tests, not continuous.
Online sensors
The continuous trend
Best for: 24/7 alarms and process control at fixed points.
Limits: Costly per site; drift and fouling need regular checks.
Validated against the gold standard
Checked against the lab reference
In pilots with fish farms in Norway and Portugal, NS2 nitrite readings agreed with the Griess method, the laboratory reference, across trout, salmon smolt, carp, tilapia and shrimp systems.
The science behind it
NS2 is built on more than 25 years of peer-reviewed research on nitrite electrochemical sensors.
Mediator-Free Nitrite Detection
"An efficient non-mediated amperometric biosensor for nitrite determination" — Biosensors and Bioelectronics, 2010
Read the research summary
Tungsten Oxide Nanoparticles for Nitrite Sensing
"Synthesis of WO₃ nanoparticles for biosensing applications" — Sensors and Actuators B: Chemical, 2016
Read the research summary
Disposable Point-of-Care Tests for Nitrite
"Construction of effective disposable biosensors for point of care testing of nitrite" — Talanta, 2015
Read the research summary
Sensing Nitrite with an Enzyme, a Polymer and a Mediator
"Biosensing nitrite using the system nitrite reductase/Nafion/methyl viologen — A voltammetric study" — Biosensors and Bioelectronics, 2007
Read the research summary
A Nearly Reagent-Free Point-of-Care Nitrite Test
"A quasi-reagentless point-of-care test for nitrite and unaffected by oxygen and cyanide" — Scientific Reports, 2019
Read the research summary
Availability
Availability
Contact us for pricing and delivery.
| Analyte | Freshwater | Marine |
|---|---|---|
| Nitrite | Available now | Available now |
| Nitrate | 2027 | 2027 |
| Ammonium | Available now | 2028 |
Frequently asked questions
Why electrochemical rather than colorimetric?
Because the reading is an electric current and not a colour, cloudy or coloured samples do not shift the result.
How is specificity achieved?
An enzyme layer reacts with the target compound — with nitrite on the nitrite strip — so other ions in the sample stay out of the reading.
Is the method patented?
A European patent is granted and a US patent is pending.
What does the reader actually do?
It powers the cartridge, measures the current the strip produces and sends the number to your phone over Bluetooth. The phone is the display.
How is the science validated?
The methods build on more than 25 years of published, peer-reviewed research, and the enzyme approach already has regulatory standing.