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Water-quality sensors for people building devices: everything speaks I²C or 1-Wire, with Arduino, Raspberry Pi, and Home Assistant libraries documented for each part.
Kits
5 items
Hydroponic Monitoring Kit
Everything needed to measure pH and EC for hydroponic devices. Includes carrier board, isolated sensor modules, temperature sensor, and industrial probes. Home Assistant YAML makes it easy to integrate into your system. Measures Hardware Water nutrient level Isolated mod-EC Water pH Isolated mod-pH
$378.00
Hydroponic/Aeroponic Kit
Everything needed to measure nutrient levels, pH and temperature, just add a controller and box Measures Hardware nutrient level Isolated - mod-EC - Industrial EC Probe pH Isolated - mod-pH - Industrial pH Probe Temperature mod-NTC - Industrial EC Probe NTC Board isolated sensor modules permanently mounted screw terminals for secure connections mounting holes in all four corners for mounting in an enclosure open-source for easy custom board development Probes comes with industrial probes suitable for constant submersion connections are terminal block plug&socket Industrial EC Probe has an embedded temperature sensor for simplified deployment Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Downloads 3D Viewer and file exporter
from $160.00
Pool/Spa Kit
Everything needed to monitor a pool or spa Measures Hardware pH Isolated - mod-pH - Industrial pH Probe ORP Isolated - mod-ORP - Industrial ORP Probe Temperature Thermowell Temperature Sensor Board isolated sensor modules permanently mounted screw terminals for secure connections mounting holes in all four corners for mounting in an enclosure open-source for easy custom board development Probes comes with industrial probes suitable for constant submersion connections are terminal block plug&socket Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Downloads 3D Viewer and file exporter
from $130.00
Lab Kit
Measure the most common water-quality parameters Measures Hardware EC Isolated - mod-EC - Lab EC Probe pH Isolated - mod-pH - Lab pH Probe ORP Isolated - mod-ORP - Lab ORP Probe Temperature mod-NTC - 10K NTC Board isolated sensor modules permanently mounted screw terminals for secure connections mounting holes in all four corners for mounting in an enclosure open-source for easy custom board development Probes comes with lab probes for quicker and more accurate measurements All probes have BNC connectors, the board has SMA-BNC adapter bulkheads which allow easy enclosure pass-through connections Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Downloads 3D Viewer and file exporter
from $220.00
Freshwater Aquarium Kit
Everything needed to monitor the major water quality parameters for a freshwater aquarium Measures Hardware EC Isolated - mod-EC - Lab EC Probe pH Isolated - mod-pH - Lab pH Probe Temperature mod-NTC - 10K NTC Board isolated sensor modules permanently mounted screw terminals for secure connections mounting holes in all four corners for mounting in an enclosure open-source for easy custom board development Probes comes with lab probes for minimal size all probes have BNC connectors, the board has SMA-BNC adapter bulkheads which allow easy enclosure pass-through connections Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Downloads 3D Viewer and file exporter
from $160.00Sensor Modules
5 items
Mod-EC
Add the ability to measure EC to your custom hardware application with a fully digital I2C interface Specifications 💬 Interface I²C 🎯 Accuracy ±0.01 mS/cm in a range of 0.1 mS/cm to 1 mS/cm ±0.1 mS/cm in a range of 1 mS/cm to 10 mS/cm temperature compensated ↕️ Calibration single, double, triple point routines on-chip ⚡ Voltage 3.3v ⏱️ Time 750 ms/reading Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Options Pins pre-soldered pins for use in a breadboard Castellations for use in a custom-made board to permanently mount the module
from $35.00
Mod-pH
Add the ability to measure pH to your hardware application with a fully digital I2C interface Specifications 💬 Interface I²C 🎯 Accuracy ±0.005 pH over the entire pH range of 0-14 pH temperature compensated ↕️ Calibration single, double, and triple point routines on-chip ⚡ Voltage 3.3v ⏱️ Time 750 ms/reading Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Options Pins pre-soldered pins for use in a breadboard Castellations for use in a custom-made board to permanently mount the module
from $35.00
Mod-ORP
Add the ability to measure ORP to your hardware application with a fully digital I2C interface Specifications 💬 Interface I²C 🎯 Accuracy ±0.1 mV between -2230 to 2230 mV ↕️ Calibration single-point routine on-chip ⚡ Voltage 3.3v ⏱️ Time 750 ms/reading Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Options Pins pre-soldered pins for use in a breadboard Castellations for use in a custom-made board to permanently mount the module
from $35.00
Mod-ISO
An easy solution to create regulated and isolated power for I²C buses Specifications 💬 Interface I²C 💪 Power 66-mW power output at 3.0-volt input 100-mW power output at 5.5-volt input ⚡ Voltage 3.0 - 5.5 v input 3.3 volt regulated output Options Pins pre-soldered pins for use in a breadboard Castellations for use in a custom-made board to permanently mount the module
from $25.00
Mod-NTC
Add the ability to measure a 10K NTC temperature sensor to your hardware application with a fully digital I2C interface Specifications 💬 Interface I²C 🎯 Accuracy Resolution 0.125 °C no self-heating error ↕️ Calibration Configurable beta calibration ⚡ Voltage 3.3v ⏱️ Time 150 ms/reading Development Developer page for Arduino, Raspberry Pi, and Home Assistant/ESPHome example code and wiring Options Pins pre-soldered pins for use in a breadboard Castellations for use in a custom-made board to permanently mount the module
from $30.00Probes
12 items
Lab Conductivity Probe K1
A conductivity probe for use in a lab setting Connector Male BNC Cable Length 1 meters Measurement Range 1 uS/cm — 10 mS/cm (when using Mod-EC) Dimensions 12x155mm Materials Glass body with black platinum electrodes Cell-constant K1±0.2
$50.00
Lab pH Probe + Calibration Powder
A pH probe for use in a lab setting Connector Male BNC Cable Length 1 meters Measurement Range 0 - 14 pH Dimensions 12x155mm Materials Nylon Response time 90% in 1 second
$40.00
Lab ORP Probe
An ORP probe for use in a lab setting Connector Male BNC Cable Length 1 meters Measurement Range -2000mV - 2000mV Dimensions 12x155mm Materials Nylon Response time 90% by 7 second
$50.00
DS18B20 Probe
Waterproof DS18B20 1-Wire temperature probe Connector bare wire Cable Length 1 meters Measurement Range 5 - 60 °C (41 - 150 °F) Materials Stainless steel shell Response time 750 ms/reading
from $15.00
Industrial Conductivity Probe K1
A ruggedized conductivity probe with an embedded 10K NTC temperature sensor Connector pin terminals Cable Length 3 meters Measurement Range 100 uS/cm — 10 mS/cm (when using Mod-EC) Dimensions 30x133 mm, 3/4" NPT threads Materials Nylon threaded end, 316L stainless steel electrode Cell-constant K1 Connections Both EC and NTC use two wires, neither set is polarized White-capped wires are NTC Gray-capped wires are EC
$140.00
Industrial pH Probe
A ruggedized pH probe for continuous submersion Connector pin terminals Cable Length 3 meters Measurement Range 0 - 14 pH Dimensions 30x133 mm, 3/4" NPT threads Materials Nylon Response Time 90% by 7 seconds Connections yellow-capped wire is the sensing electrode black-capped wire is the reference electrode
$130.00
Industrial ORP Probe
A ruggedized ORP probe for continuous submersion Connector pin terminals Cable Length 3 meters Measurement Range -2000mV - 2000mV Dimensions 30x133 mm, 3/4" NPT threads Materials Nylon Response Time 90% by 7 seconds Connections yellow-capped wire is the sensing electrode black-capped wire is the reference electrode
$130.00
Weatherproof SHT30
Measure temperature and humidity with a Sensiron SHT30 sensor in weatherproof housing
$25.00
Thermowell Temperature Sensor
A DS18B20 1-Wire digital temperature sensor housed in a 1 inch NPT threaded stainless steel thermowell Connector bare wire Cable Length 1 meters Measurement Range 5 - 60 °C (41 - 150 °F) Dimensions 1 inch NPT threaded body Materials Stainless steel shell Response time 750 ms/reading
$20.00
Lab pH Probe
A pH probe for use in a lab setting Connector Male BNC Cable Length 1 meters Measurement Range 0 - 14 pH Dimensions 12x155mm Materials Nylon Response time 90% by 1 second
$40.00
Waterproof 10K NTC
A waterproof 10K NTC temperature sensor. Accurate to within ±1% for ranges between -40 to 105 °C. Datasheet
from $12.00
Weatherproof SHT30
Measure temperature and humidity with a Sensiron SHT30 sensor in weatherproof housing Connector bare wire Cable Length 1 meters Measurement Range ±0.3% °C temperature accuracy from 0°C to 65°C ±3% RH humidity accuracy from 0 to 100% Materials Epoxy-sealed electronics Sintered-mesh enclosure for weatherproofing
$25.00Carrier Boards
3 items
Dual Isolated Carrier Board
This carrier board is meant to be used with our lab probes
$10.00Mod-passthrough
Used in the power slot of carrier boards when isolation isn't needed
$3.00Dual 5mm Carrier Board
This carrier board is meant to be used with our industrial probes, which are all terminated with pin connectors and fit neatly into the 5mm terminal blocks
$10.00Accessories
2 items
Qwiic Wires
Connect a Qwiic connector to a: Female header: these have a Qwiic connector on one side and pins on the other. Male header: these have a Qwiic connector on one side and slots on the other. Qwiic connector: A Qwiic to Qwiic connector.
from $1.50
SMA-BNC Bulkhead
Male SMA to male BNC bulkhead
$7.00Reference Designs
1 item
Custom work
If you don’t find exactly what you’re looking for, we can probably make it for you. Our sensor designs can be purchased — a good option for companies that want to create a device without the development time, or that want more control over their supply chain.
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