Portable pH/EC/TDS/Temperature Tester featuring CAL Check™

Portable pH/EC/TDS/Temperature Tester featuring CAL Check™ for temperature and humidity monitoring with recorded data

This instrument fits facility teams, storage operators, laboratories, and compliance users that need a practical way to capture data during building a reliable record of environmental conditions for quality, traceability, and troubleshooting. 

All-in-One Meter for Greenhouse, Hydroponic, and Agricultural Use

The HI9813-61 is a durable, water-resistant handheld meter that combines pH, conductivity (EC), total dissolved solids (TDS), and temperature measurements in a single probe. Its CAL Check™ feature ensures the electrode is functioning properly, helping users avoid inaccurate readings and maintain optimal growing conditions.

This versatile meter is highly valued by horticulturists, hydroponic growers, and greenhouse operators for its reliable measurements, ease of use, and protection against electrical noise. Compared to other handheld meters, the HI9813-61 stands out for its pre-amplified electrode, variable EC/TDS conversion, and maintenance-free probe design.

HI1285-61 Polypropylene Body Probe

The included HI1285-61 probe houses the pH, EC, TDS, and temperature sensors in a single polypropylene body with a DIN connector, offering a robust and compact solution for field and greenhouse monitoring.

Amplified pH Electrode

The built-in amplifier reduces interference from electrical noise, which is common in greenhouse environments due to motors, ballasts, and pumps, ensuring accurate high-impedance pH measurements.

Amperometric EC/TDS Sensor

The EC/TDS sensor measures conductivity by applying an alternating voltage between stainless steel pins. Conductance increases proportionally with the amount of dissolved salts, allowing precise monitoring of fertilizer and nutrient levels.

Polypropylene Body

Durable and gel-filled, the single-body probe is maintenance-free and contains three sensors: pH, EC/TDS, and temperature. Its design ensures long-lasting performance without the need for electrolyte refills.

• 3 sensors in a single probe
• Pre-amplified pH electrode resistant to electrical noise
• Gel-filled, maintenance-free pH electrode

Water Resistant Design

The meter is fully water-resistant, making it suitable for wet greenhouse environments and outdoor measurements.

CAL Check™

CAL Check™ allows users to verify the pH electrode condition before measurement. By placing the HI1285-61 probe in the HI50021 solution and pressing "Check," the meter will display "Probe is OK" or "Clean Probe and Calibrate," preventing inaccurate readings that could affect plant growth.

Variable EC to TDS Conversion Factor

• Automatic adjustment from 0.56 to 0.78 based on actual EC readings
• Conversion factor follows the 442 curve for natural water

Automatic Temperature Compensation

• All readings are automatically adjusted for temperature variations

Low Battery Indicator

Alerts users when battery levels are low, ensuring uninterrupted operation in the field.

Supporting comprehensive liquid quality assessment in industrial contexts where a portable multi‑parameter tester is deployed

For precise acidity monitoring in semi‑solid formulations and batch control, the Hanna pH Meter for Cosmetic Creams delivers lab‑grade pH evaluation with Bluetooth connectivity and IP65 protection, ideal for cosmetic and formulation quality checkpoints. Complementing pH and conductivity measurements with focused food chemistry applications, the Chocolate pH meter is engineered to ensure consistency in chocolate processing through accurate pH and temperature compensation. At the upper end of analytical capability, the Multiparameter pH meter / ORP / EC / Pressure / Temperature Waterproof Meter provides a robust platform for tracking multiple water quality parameters including pH, ORP, EC, and temperature with data logging, making it suitable for field and laboratory quality control programs.

Technical Q&A

What measurements can the HI9813-61 perform?

The meter measures pH, EC, TDS, and temperature using a single probe.

How does CAL Check™ help users?

CAL Check™ diagnostics verify probe integrity, alerting users to clean, calibrate, or replace the electrode before taking readings.

What environments is the meter suitable for?

It is ideal for greenhouses, hydroponics, and agricultural applications where water quality and nutrient levels must be monitored accurately.

How is the probe protected from electrical interference?

The pH electrode is pre-amplified to minimize noise from pumps, motors, and lighting systems.

Application Q&A

When is data logging especially valuable?

Logging is valuable when trends matter more than a single spot reading, such as curing history, storage conditions, verification records, or alarm-driven incident response.

Who is this best suited for?

Facility teams, storage operators, laboratories, and compliance users will get the most value when they need repeatable measurements plus a record they can review, export, or act on later.

Because it combines 3 in 1 probe with pH, EC/TDS and temperature sensors, Amplified pH electrode for immunity to electrical noise including from ballasts and pumps, CAL Check™, this product is a strong fit for temperature and humidity monitoring with recorded data where documentation and repeatability are important.