Digital pH & Temperature Pen – Waterproof Hydroponic pH Tester with ATC

This digital pH and temperature pen is a compact, high-accuracy testing instrument designed for fast and reliable measurement of pH levels and solution temperature in hydroponic systems, nutrient reservoirs, and water sources.

Engineered for durability and ease of use, the unit provides instant readings directly from solution, eliminating the need for complex testing procedures. Its fully waterproof construction ensures reliability in demanding grow environments, while automatic temperature compensation (ATC) maintains measurement accuracy across varying conditions.

The device features a simple two-point calibration system for precision control, making it suitable for both beginner and professional growers requiring consistent pH management for optimal nutrient uptake.

Key Benefits

Digital pH and temperature measurement. Simultaneous pH and temperature readings from a single probe for fast, complete solution analysis.
Fully waterproof construction. Submersible design built for reliable use in wet grow environments, not just splash-resistant.
Automatic temperature compensation (ATC). Adjusts pH readings based on solution temperature to maintain accuracy across varying conditions.
Fast, direct measurement. Submerge and read. No mixing, no test strips, no delays.
Two-point calibration. Simple manual calibration process for precision control across the full pH range.
Compact and portable. Handheld pen design for easy use across multiple reservoirs, tanks, and water sources.

How It Works

Submerge the probe into solution. Insert directly into nutrient solution, reservoir water, or any liquid sample.
Simultaneous pH and temperature sensing. The sensor measures both parameters at the same time for a complete reading.
ATC adjusts for temperature variation. Automatic temperature compensation corrects pH values in real time, eliminating temperature-induced measurement error.
Instant display output. Results appear immediately on the digital screen for fast decision-making.

System Features

Fully waterproof body. Submersible construction rated for direct immersion in nutrient solutions and water samples.
Integrated temperature measurement. Dual-function sensor eliminates the need for a separate thermometer.
ATC technology. Automatic temperature compensation ensures consistent accuracy regardless of solution temperature.
Two-point manual calibration. Calibrate at two reference points for high precision across the measurement range.
Auto shut-off function. Extends battery life by powering down automatically when not in use.
Battery included. Ready to use out of the box with 1 x AAA battery supplied.

Applications

Hydroponic nutrient reservoir pH testing Australia
Digital pH meter for water quality monitoring
pH pen for nutrient solution management in DWC and recirculating systems
Aquarium and fish tank water pH testing
Soil runoff and irrigation water pH measurement
Drinking water and general water quality testing

Common Use Cases

Hydroponic nutrient reservoir testing. Monitor and maintain optimal pH levels for maximum nutrient availability and plant uptake.
Aquarium water quality monitoring. Ensure stable pH conditions for fish and aquatic plant health.
Soil runoff pH testing. Measure leachate pH to assess soil and growing media conditions.
Drinking water testing. Verify water quality for safe consumption and general household use.

What Sets It Apart

This pH and temperature pen combines waterproof construction with automatic temperature compensation to deliver consistent, accurate readings across all growing conditions. Its compact form factor, fast response time, and simple calibration process make it an essential instrument for any grower managing nutrient solution pH on a regular basis.

Technical Specifications

Measurement Type. pH and temperature (simultaneous)
Calibration. Two-point manual calibration
Temperature Compensation. Automatic (ATC)
Waterproof Rating. Fully waterproof, submersible design
Power Supply. 1 x AAA battery (included)
Auto-Off Function. Yes, battery saving
Product Weight. Approximately 0.1 to 0.2 kg
Packaged Shipping Weight. Approximately 0.2 to 0.3 kg

Frequently Asked Questions

How often should I calibrate Bluelab pH & Temperature Pen?

pH meters should be calibrated before every use or at minimum every 2–3 days during active grows. EC meters are more stable but should be verified against a known reference solution weekly. Bluelab pH & Temperature Pen uses two-point calibration for pH (4.0 and 7.0 buffer solutions) and single-point calibration for EC (2.77 mS/cm standard). Regular calibration is the single most important factor in measurement accuracy.

How do I store Bluelab pH & Temperature Pen properly?

Always store pH probes wet — never allow the probe tip to dry out as this permanently damages the glass membrane. Use the probe storage solution supplied with Bluelab pH & Temperature Pen or Bluelab KCl storage solution. EC probes are more robust but should also be rinsed with clean water after each use. Store Bluelab pH & Temperature Pen at room temperature away from direct sunlight.

What should I do if Bluelab pH & Temperature Pen is reading incorrectly?

First, recalibrate using fresh buffer solutions — old or contaminated calibration fluid is the most common cause of inaccurate readings. Rinse the probe thoroughly with deionised or distilled water between calibrations. If readings are still inconsistent after recalibration, check the probe for physical damage or contamination. Most probes have a service life of 12–18 months with proper care.

Is Bluelab pH & Temperature Pen waterproof?

Check the IP rating listed in the product specifications. Most handheld meters are splash-proof but not designed for submersion. Take care when measuring in deep reservoirs to avoid dropping the unit. Bluelab pH & Temperature Pen is designed for hydroponic nutrient solution testing — it is not rated for outdoor or continuous immersion use.

Does Bluelab pH & Temperature Pen ship fast within Australia?

Yes — Bluelab pH & Temperature Pen ships from our Australian warehouse with fast tracked delivery Australia-wide. Most east coast orders arrive within 2–5 business days. WA, NT, and TAS orders typically arrive within 5–12 business days.