Best Bluelab in 2026

Store your Bluelab pH probes in KCL storage solution to extend their life and improve accuracy

Easy pour spout for quick application

Includes one (1) bottle of storage solution at 100ml

Quickly monitor for precise up and down of your nutrient (TDS) level in solution to maximize your grow and ensure plants get the balanced feed they need; Measures while mixing nutrients in your tank

Large measurement range; 4 to 60 CF, 0.4 to 6.0 EC, 200 to 3000 ppm (EC x 500), 280 to 4200 ppm (EC x 700); General uses include gardening, hydroponics growing tent and reservoir

Comes factory calibrated so no calibration required and is fully waterproof; Automatic Temperature Compensation provides consistent reading regardless of any fluctuations in temperature

PH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope)

Store in a cool place out of direct sun and heat

They should be stored with the lids securely tightened

Clean lab quality pH probes with Bluelab pH Probe Care Kit; General uses for probes include growing tent, reservoir, water tank, and hydroponics

Probe care extends the life of probes and improves accuracy of pH up and down measurements; Regular hydration of a pH probe in KCl solution is key for a longer lifespan

Try Bluelab Care Kit Conductivity for full cleaning set of TDS (ppm) tester, meter and other tools for full garden nutrient monitoring system in water and soil

ULTIMATE HANDHELD pH TESTER – Loved by growers the world over, the Bluelab pH Pen makes measuring pH and temperature in solutions fast, accurate and reliable. Turn on, dip into the solution, get an instant digital pH measurement. No more test strips or reagent kits – get instant, accurate pH measurements of liquids. Ideal for commercial and hobby growing of fresh produce, flowering crops, shrubs and container crops.

HELP YOUR PLANTS GROW - Closely monitor and adjust the pH levels in hydroponic reservoirs, run-off or soil solutions to optimize plant health and performance. Spot check then adjust the pH levels in nutrient solutions to optimize nutrient up-take. This handy device helps you know the nutrient you add will be available to the plant.

QUALITY FEATURES - Fully waterproof, temperature compensated pH measurement, simple 2-point calibration process, selectable units for ̊C and ̊F, backlit LCD display, hold measurement display function, Auto-off function, 30-day calibration indicator, low battery warning, and tethered probe cap with KCl probe storage reservoir to extend probe life

Conductivity pen can test and monitor your nutrients (TDS) level to maximize your grow and ensure plants get the balanced feed they need; General uses include growing tent, swimming pool, drinking water, aquarium, fish tank, and brewing

This hydroponics tester has ATC that provides consistent reading regardless of any fluctuations in temperature; Durable design for repeated uses and fully waterproof and it floats in any solution

Calibration optional, the meter comes factory calibrated so it's ready to be used; Regular cleaning is recommended for accurate reading; Different units are available (EC, PPM 500, PPM700, and CF)

Product 1: Measures temperature and pH (acid or alkaline) in nutrient solution, soil, and other media for precise up and down adjustment with lab quality glass probe; General uses include growing tent, swimming pool, aquarium, fish tank, coco, and rockwool

Product 1: This hydroponics tool has ATC that provides consistent reading regardless of any fluctuations in temperature, and reminds when you need calibration; Durable design for repeated uses and fully waterproof

Product 1: More accurate and convenient than test strips and other testing methods; Combine with TDS pen, meter, and other testers for full garden nutrients monitoring in water and soil

Product 1: 24/7 test, monitor control (doser) for your pH up and down in water to maximize your grow and ensure plants get a balanced feed (nutrients) with lab quality glass probe; General uses include growing tent and reservoir

Product 1: This hydroponics digital tester has ATC that provides consistent reading regardless of any fluctuations in temperature; High and low alarm when outside parameters with safety lockout

Product 1: Automated dosing with intuitive on-time/off-time for single-direction control; Combine with conductivity (TDS) pen and other meters for full garden nutrient monitoring in water and soil

Measures pH in nutrient solution (acid or alkaline) for precise up and down adjustment and is used with meters; General uses include growing tent, reservoir, water tank, and hydroponics

2 meter / 6.56 foot standard cable, easy calibration, fully waterproof including cable joint, easy to clean and maintain

Double junction probe has a longer lifespan compared to standard probes due to less contamination and is more accurate and reliable than comparable pens, test strips, drops, and more

Monitor pH up and down, temperature, nutrient (TDS) level in water to maximize your grow and ensure plants get a balanced feed; General uses includes growing tent and reservoir; Selectable conductivity units include TDS, EC, ppm 500, ppm 700 and CF

This hydroponics tester has ATC that provides consistent reading regardless of any fluctuations in temperature; High and low alarm when outside parameters, selectable units include TDS, EC, ppm 500, ppm 700 and CF

Lab quality glass pH probe with easy two point calibration; Conductivity / temperature probe comes factory calibrated so it's ready to be used; Double junction probe is more accurate than test strips and drops

Backlit LCD display

Fully waterproof

Automatic Temperature Compensation

The Bluelab calibration and conductivity standard solutions are essential for use with all Bluelab

Calibration of pH and testing the cleanliness of the Bluelab Conductivity/Temperature probe

Bluelab Calibration and conductivity standard solutions... a must in every grower's toolbox.

Meters and solutions from Hydrofarm.

Backed by 100% manufacturer's warranty.

Bluelab 4.0 250 ML Calibration Solution

Monitor 3 parameters in water and soil: Conductivity (TDS) level to ensure plants get the balanced feed, pH up and down, and temperature with lab quality glass probe; Gereral uses include growing tent, swimming pool, drinking water, and aquarium

This hydroponics meter has ATC that provides consistent reading regardless of any fluctuations in temperature; Leap pH probe works in multiple growing environments; Conductivity scales include EC, PPM, and CF

Combine with Bluelab pen, tester, monitor and controllers for full indoor garden nutrients monitoring in water and soil; pH probe requires easy two point calibration; Conductivity / temperature probe are factory calibrated and ready for use

Monitor pH in water and soil (acid or alkaline) for precise up and down adjustments with lab quality probe; General uses incude indoor gardeing, growing tent, swimming pool, drinking water, aquarium, fish tank, coco, rockwool, and more

Measures pH level to maximize your grow and ensure plants get a balanced feed; Reminds you for calibration every 30 days; Combine with Bluelab conductivity meter and tester for full garden nutrient monitoring in water and soil

This hydroponics tool has ATC that provides consistent reading regardless of any fluctuations in temperature; pH probe is double junction, which has a longer life span compared to regular probes due to reduced contamination

Product 1: Measures pH, temperature and (tds) EC, ppm 500, ppm 700 and CF with lab quality glass that can be used for the pool, drinking water, hydroponics, brewing, and growing

Product 1: EASY two point calibration and auto temperature compensation makes this digital meter a handy tool with backlit LCD display and calibration reminders

Product 1: Quickly monitor your nutrient level to maximize your grow and ensure plants get the balanced feed they need

HELP YOUR PLANTS GROW - Fast, reliable and versatile: Combo Meter Plus means you will be able to measure more and build a better understanding of your complete growing system. The multimedia Leap pH probe can be used to measure nutrient solution and directly in the rootzone in a range of growing substrates including soil, rockwool, coco coir and peat.

PLANT HEALTH IN THE PALM OF YOUR HAND - Manage, control & monitor your plant health & performance. The Bluelab Combo Meter Plus device will fit in the palm of your hand which will allow you to spot check wherever you are! The backlit, easy-to-read display and 2m/6’ cables give you the ability to measure in places previously inaccessible. Get answers at your fingertips.

SIMPLE & EASY TO USE - This device is all you need for simple, reliable nutrient solution and root zone management. Featuring a detachable pH probe with simple, 2-point calibration makes for ease maintenance. Get up and running fast. Quick and intuitive to use with simple one button presses to change between measurements. The Bluelab Combo Meter Plus a simple quick start guide to help you get started fast.

Test, measure and control (doser) pH and nutrients (tds) in solution to make precise up and down adjustments with lab quality probes for use in hydroponic system and grows with reservoirs; multi-part nutrient dosing with Peripods

EASY two point calibration for pH sensor, and auto temperature compensation, with backlit LCD display and calibration reminders; EC probe is factory calibrated; Data logging with Bluelab Connect software (Connect stick sold separately)

24/7 meter for your nutrient and ph level to maximize your grow and ensure plants get the balanced feed they need; high and low alarm when outside parameters; tester parameters can be viewed on mobile phone

ENSURE pH METER ACCURACY – Regularly calibrate your pH measurement devices with pH calibration reference solutions to ensure measurement accuracy. Always clean and calibrate your pH probes at two pH points for improved accuracy – pH 4.0 and pH 7.0. A well calibrated pH meter will always be more accurate and precise

HELP YOUR PLANTS GROW – Optimal nutrient solution for plants starts with accurate pH probes. Ensure your pH is always on-point with regular pH calibration.

FOR ALL BLUELAB pH DEVICES – Use with all Bluelab products that measure pH: Bluelab pH Pen, Bluelab Soil pH Pen, Bluelab Combo Meter, Bluelab Combo Meter Plus, Bluelab Multimedia pH Meter, Bluelab Guardian Monitor, Bluelab pH Controller and Bluelab Pro Controller.

Designed for use with Bluelab Pro Controller (CONTPRO) to monitor and control pH up and down and nutrient level; General uses include growing tent, reservoir, water tank, and hydroponics

Automatically maintain parameters (pH, temperature TDS, PPM, and EC) in your reservoir; No need for spot checks or manual adjustments

Pro Controller with pumps are compatible with most modern growing systems including recirculating and drain to waste systems; Combine with pH pen, TDS (ppm) tester, and other meters for full indoor garden nutrients monitoring in water and soil

Monitor pH up and down, temperature, nutrient (TDS) level in water to maximize your grow and ensure plants get a balanced feed; General uses includes growing tent and reservoir; Selectable conductivity units include TDS, EC, ppm 500, ppm 700 and CF

This hydroponics tester has ATC that provides consistent reading regardless of any fluctuations in temperature; High and low alarm when outside parameters; Data logging with Bluelab Connect software

Lab quality glass pH probe with easy two point calibration; Conductivity / temperature probe comes factory calibrated so it's ready to be used; Double junction probe is more accurate than test strips and drops

Measures pH and temperature. Selectable units for °C and °F. Backlit LCD display. Double junction probe (not replaceable).

Successful calibration indicator. Hold reading function and low battery warning.

Fully waterproof with auto off function. Automatic temperature compensation.

Easy to clean

Gel filled (non-refillable)

Double junction reference

Product 1: Measures temperature and pH (acid or alkaline) in nutrient solution, soil, and other media for precise up and down adjustment with lab quality glass probe; General uses include growing tent, swimming pool, aquarium, fish tank, coco, and rockwool

Product 1: This hydroponics tool has ATC that provides consistent reading regardless of any fluctuations in temperature, and reminds when you need calibration; Durable design for repeated uses and fully waterproof

Product 1: More accurate and convenient than test strips and other testing methods; Combine with TDS pen, meter, and other testers for full garden nutrients monitoring in water and soil

Product 1: with lab quality glass probe;

Product 1: This hydroponics tester has ATC that provides consistent reading regardless of any fluctuations in temperature;

Product 1: Double junction electrode has a longer lifespan compared to standard probes due to less contamination and is more accurate and reliable than comparable pens, test strips, drops, and more

Electronically controlled mains switching box that is designed to activate equipment via control signals from Bluelab Pro Controller; General uses include hydroponic system and plant growing tent

Temperature is a key parameter for healthy root and optimal nutrient absorption; PowerPod can help control reservoir temperature when combined with heater or cooler

Try Bluelab pH pen, EC meter, and other digital testers for full indoor garden nutrients monitoring in water and soil