What does the Bluelab OnePen measure?
The Bluelab OnePen measures pH, electrical conductivity and temperature, combining three important nutrient solution measurements in one handheld meter.
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Bluelab OnePen – pH, EC & Temperature Meter
Please sign in to see pricing
11500
£115.00
Unit price perEstimated delivery between September 15 and September 17.
Professional 3-in-1 handheld meter for measuring pH, EC and temperature from a single replaceable probe.
The Bluelab OnePen brings three of the most important nutrient solution measurements together in one compact meter. Instead of switching between separate pH and conductivity pens, growers can measure pH, electrical conductivity and temperature with one handheld device.
A bright backlit display can show pH and EC readings simultaneously, making routine reservoir and nutrient checks quicker and easier. The OnePen also offers automatic temperature compensation, multiple conductivity measurement scales and a probe health indicator to help growers stay on top of meter maintenance.
Built-in Bluetooth connectivity allows the OnePen to connect with Edenic by Bluelab, adding digital recording, real-time data sharing and access to measurement history for growers who want more than a simple spot-check meter.
Why choose the Bluelab OnePen?
- 3-in-1 measurement – measure pH, conductivity and temperature with a single handheld meter.
- Simultaneous pH and EC readings – view both key nutrient solution measurements together on the backlit display.
- Replaceable probe – the combined pH, conductivity and temperature probe can be replaced separately rather than replacing the complete meter.
- 0.01 pH resolution – provides precise pH measurements across a 0.0 to 14.0 pH range.
- Multiple conductivity scales – select EC, mS/cm, CF, ppm 500 (TDS) or ppm 700.
- Automatic temperature compensation – compensates measurements for changes in solution temperature.
- Bluetooth connectivity – connect to Edenic by Bluelab for digital data management and real-time measurement sharing.
- IP68 rated – designed with dust and waterproof protection for demanding growing environments.
- Probe health indicator – helps you keep track of the condition of the replaceable probe.
What does the Bluelab OnePen measure?
The Bluelab OnePen measures pH, electrical conductivity and temperature in nutrient solutions. Together, these readings give growers a clearer picture of the conditions around the root zone and help with day-to-day nutrient management.
Conductivity can be displayed as EC, mS/cm, CF, ppm 500 (TDS) or ppm 700, while temperature can be displayed in either °C or °F. This makes the OnePen suitable for growers working with different nutrient programmes and conductivity scales.
Designed for nutrient solution monitoring
The OnePen is suitable for checking hydroponic nutrient solutions, reservoirs, runoff and source water. Its combination of pH, EC and temperature measurement makes it particularly useful where growers would otherwise need separate meters to monitor their solution.
The compact handheld format works equally well for regular grow-room checks and professional crop management, while Edenic connectivity gives commercial growers and data-focused users the option to record and manage measurements digitally.
How to use the Bluelab OnePen
Before first use, hydrate the pH bulb in Bluelab KCl Storage Solution for 24 hours and complete the required pH calibration using fresh pH 7.0 and pH 4.0 calibration solutions.
Switch the OnePen on and select the required measurement mode. Available modes include EC/pH, pH/temperature and EC/temperature. Place the probe into the nutrient solution and allow the readings to stabilise.
After use, rinse the probe with fresh tap water and keep the storage-cap sponge moist with Bluelab KCl Storage Solution. Regular cleaning and calibration will help maintain dependable measurements and extend the useful life of the replaceable probe.
Product details
| Brand | Bluelab |
|---|---|
| Product | OnePen |
| Product type | 3-in-1 handheld pH, EC & temperature meter |
| Measurements | pH, conductivity (EC) & temperature |
| pH range | 0.0 – 14.0 pH |
| pH resolution | 0.01 pH |
| pH accuracy | ±0.05 at 25°C |
| EC range | 0 – 10 EC / mS/cm |
| EC resolution | 0.01 |
| EC accuracy | ±0.1 at 25°C |
| Conductivity units | EC, mS/cm, CF, ppm 500 (TDS) & ppm 700 |
| Temperature range | 0 – 50°C / 32 – 122°F |
| Temperature resolution | 0.1°C / 0.1°F |
| Temperature accuracy | ±1°C / ±1°F |
| Temperature compensation | Automatic |
| Probe | Replaceable combined pH, conductivity & temperature probe |
| pH probe type | Double-junction |
| Conductivity electrodes | Titanium |
| Waterproof rating | IP68 |
| Connectivity | Bluetooth with Edenic by Bluelab |
| Power | 2 x AAA alkaline batteries |
What's included?
| Meter | 1 x Bluelab OnePen with replaceable pH, conductivity & temperature probe |
|---|---|
| Cleaning accessory | 1 x Bluelab Sensor Cleaning Brush |
| Calibration solution | 1 x Bluelab pH 7.0 Calibration Solution sachet |
| Calibration solution | 1 x Bluelab pH 4.0 Calibration Solution sachet |
| Storage solution | 1 x Bluelab KCl Storage Solution sachet |
Bluelab OnePen FAQs
Can the Bluelab OnePen measure pH and EC at the same time?
Yes. The OnePen can display pH and conductivity readings simultaneously, allowing growers to check both measurements without switching between separate meters.
What is the maximum EC reading of the Bluelab OnePen?
The OnePen has a conductivity measurement range of 0 to 10 EC. It can also display conductivity as mS/cm, CF, ppm 500 (TDS) or ppm 700.
Does the Bluelab OnePen measure temperature?
Yes. It measures solution temperature from 0 to 50°C, or 32 to 122°F, with selectable Celsius and Fahrenheit units.
Is the Bluelab OnePen waterproof?
Yes. The OnePen has an IP68 dust and waterproof rating.
Does the Bluelab OnePen have a replaceable probe?
Yes. The combined pH, conductivity and temperature probe is replaceable, allowing the sensing element to be renewed without replacing the complete meter.
Does the Bluelab OnePen connect to a phone?
Yes. Built-in Bluetooth allows the OnePen to connect to Edenic by Bluelab for real-time data sharing, measurement history and software updates.
Does the Bluelab OnePen need calibrating?
Yes. The pH probe uses two-point calibration with pH 7.0 and pH 4.0 calibration solutions. The EC sensor is factory calibrated but can also be recalibrated when required using 2.77 EC calibration solution.
How should I store the Bluelab OnePen?
Rinse the probe with fresh tap water after use and keep the sponge inside the storage cap moist with Bluelab KCl Storage Solution. The pH bulb should not be allowed to dry out.
How often should I clean the Bluelab OnePen probe?
Bluelab recommends gently cleaning both the EC electrodes and pH bulb every 30 days, followed by pH calibration and an EC performance check.
Bluelab OnePen – pH, EC & Temperature Meter
Please sign in to see pricing
11500
£115.00
Unit price perProfessional 3-in-1 handheld meter for measuring pH, EC and temperature from a single replaceable probe.
The Bluelab OnePen brings three of the most important nutrient solution measurements together in one compact meter. Instead of switching between separate pH and conductivity pens, growers can measure pH, electrical conductivity and temperature with one handheld device.
A bright backlit display can show pH and EC readings simultaneously, making routine reservoir and nutrient checks quicker and easier. The OnePen also offers automatic temperature compensation, multiple conductivity measurement scales and a probe health indicator to help growers stay on top of meter maintenance.
Built-in Bluetooth connectivity allows the OnePen to connect with Edenic by Bluelab, adding digital recording, real-time data sharing and access to measurement history for growers who want more than a simple spot-check meter.
Why choose the Bluelab OnePen?
- 3-in-1 measurement – measure pH, conductivity and temperature with a single handheld meter.
- Simultaneous pH and EC readings – view both key nutrient solution measurements together on the backlit display.
- Replaceable probe – the combined pH, conductivity and temperature probe can be replaced separately rather than replacing the complete meter.
- 0.01 pH resolution – provides precise pH measurements across a 0.0 to 14.0 pH range.
- Multiple conductivity scales – select EC, mS/cm, CF, ppm 500 (TDS) or ppm 700.
- Automatic temperature compensation – compensates measurements for changes in solution temperature.
- Bluetooth connectivity – connect to Edenic by Bluelab for digital data management and real-time measurement sharing.
- IP68 rated – designed with dust and waterproof protection for demanding growing environments.
- Probe health indicator – helps you keep track of the condition of the replaceable probe.
What does the Bluelab OnePen measure?
The Bluelab OnePen measures pH, electrical conductivity and temperature in nutrient solutions. Together, these readings give growers a clearer picture of the conditions around the root zone and help with day-to-day nutrient management.
Conductivity can be displayed as EC, mS/cm, CF, ppm 500 (TDS) or ppm 700, while temperature can be displayed in either °C or °F. This makes the OnePen suitable for growers working with different nutrient programmes and conductivity scales.
Designed for nutrient solution monitoring
The OnePen is suitable for checking hydroponic nutrient solutions, reservoirs, runoff and source water. Its combination of pH, EC and temperature measurement makes it particularly useful where growers would otherwise need separate meters to monitor their solution.
The compact handheld format works equally well for regular grow-room checks and professional crop management, while Edenic connectivity gives commercial growers and data-focused users the option to record and manage measurements digitally.
How to use the Bluelab OnePen
Before first use, hydrate the pH bulb in Bluelab KCl Storage Solution for 24 hours and complete the required pH calibration using fresh pH 7.0 and pH 4.0 calibration solutions.
Switch the OnePen on and select the required measurement mode. Available modes include EC/pH, pH/temperature and EC/temperature. Place the probe into the nutrient solution and allow the readings to stabilise.
After use, rinse the probe with fresh tap water and keep the storage-cap sponge moist with Bluelab KCl Storage Solution. Regular cleaning and calibration will help maintain dependable measurements and extend the useful life of the replaceable probe.
Product details
| Brand | Bluelab |
|---|---|
| Product | OnePen |
| Product type | 3-in-1 handheld pH, EC & temperature meter |
| Measurements | pH, conductivity (EC) & temperature |
| pH range | 0.0 – 14.0 pH |
| pH resolution | 0.01 pH |
| pH accuracy | ±0.05 at 25°C |
| EC range | 0 – 10 EC / mS/cm |
| EC resolution | 0.01 |
| EC accuracy | ±0.1 at 25°C |
| Conductivity units | EC, mS/cm, CF, ppm 500 (TDS) & ppm 700 |
| Temperature range | 0 – 50°C / 32 – 122°F |
| Temperature resolution | 0.1°C / 0.1°F |
| Temperature accuracy | ±1°C / ±1°F |
| Temperature compensation | Automatic |
| Probe | Replaceable combined pH, conductivity & temperature probe |
| pH probe type | Double-junction |
| Conductivity electrodes | Titanium |
| Waterproof rating | IP68 |
| Connectivity | Bluetooth with Edenic by Bluelab |
| Power | 2 x AAA alkaline batteries |
What's included?
| Meter | 1 x Bluelab OnePen with replaceable pH, conductivity & temperature probe |
|---|---|
| Cleaning accessory | 1 x Bluelab Sensor Cleaning Brush |
| Calibration solution | 1 x Bluelab pH 7.0 Calibration Solution sachet |
| Calibration solution | 1 x Bluelab pH 4.0 Calibration Solution sachet |
| Storage solution | 1 x Bluelab KCl Storage Solution sachet |
Bluelab OnePen FAQs
What does the Bluelab OnePen measure?
The Bluelab OnePen measures pH, electrical conductivity and temperature, combining three important nutrient solution measurements in one handheld meter.
Can the Bluelab OnePen measure pH and EC at the same time?
Yes. The OnePen can display pH and conductivity readings simultaneously, allowing growers to check both measurements without switching between separate meters.
What is the maximum EC reading of the Bluelab OnePen?
The OnePen has a conductivity measurement range of 0 to 10 EC. It can also display conductivity as mS/cm, CF, ppm 500 (TDS) or ppm 700.
Does the Bluelab OnePen measure temperature?
Yes. It measures solution temperature from 0 to 50°C, or 32 to 122°F, with selectable Celsius and Fahrenheit units.
Is the Bluelab OnePen waterproof?
Yes. The OnePen has an IP68 dust and waterproof rating.
Does the Bluelab OnePen have a replaceable probe?
Yes. The combined pH, conductivity and temperature probe is replaceable, allowing the sensing element to be renewed without replacing the complete meter.
Does the Bluelab OnePen connect to a phone?
Yes. Built-in Bluetooth allows the OnePen to connect to Edenic by Bluelab for real-time data sharing, measurement history and software updates.
Does the Bluelab OnePen need calibrating?
Yes. The pH probe uses two-point calibration with pH 7.0 and pH 4.0 calibration solutions. The EC sensor is factory calibrated but can also be recalibrated when required using 2.77 EC calibration solution.
How should I store the Bluelab OnePen?
Rinse the probe with fresh tap water after use and keep the sponge inside the storage cap moist with Bluelab KCl Storage Solution. The pH bulb should not be allowed to dry out.
How often should I clean the Bluelab OnePen probe?
Bluelab recommends gently cleaning both the EC electrodes and pH bulb every 30 days, followed by pH calibration and an EC performance check.
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11500
£115.00
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