pH Meter ST 404

* Professional PH/mV METER. PH range : 0 to 14 PH x 0.01 PH. mV range : -1999 mV to 1999 mV.

* Used the optional ORP probe to become a professional ORP meter.

*Wide manual temperature compensation adjustment can be operated by push button on the front panel easily.

* Calibration for pH 7, pH 4 and pH 10 by push button.

* Temperature compensation of pH function can be done by optional ATC (Automatic Temperature

Compensation) probe.

* Auto shut off saves battery life.

* Memorize Max./Min. reading with recall.

* Data hold.

* RS232 computer interface.

* allong with new approach and systematic circute for pH electrode depend on final version.

Specification :

Display 51 mm x 32 mm, dual function LCD display,

Measurement pH 0 to 14, mV -1999 mV to 1999 mV

Operating Temperature 0 ℃ to 50 ℃(32 ℉ to 122 ℉).

Operating Humidity Max. 80% RH.

Temperature Compensation Manual 0 to 100 ℃, be adjusted by push button on front panel.

Automatic ( ATC ) With the optional TEMP probe ( TP-07 )0 to 65℃.

pH Calibration PH7, PH4, and PH10, 3 points calibration

Memory Recall Maximum and Minimum reading values can be saved

and retrieved by record function.

Sampling Time Approx. 0.8 second.

Power off Auto shut off saves battery life

Data Output RS 232 computer serial interface.

Overload indication “- – – -” symbol on the display.

Power Current Approx. DC 7 mA.

Power Supply 006P DC 9V battery

Weight 250 g/0.55 LB ( battery included ).

Size ( meter ) 195 x 68 x 30 mm ( 7.6 x 2.6 x 1.2 inch ).

pH electrod superior Nano compound applied in filling solution technology

SKU: ST 404 Category: pH Meter Tag: pH Meter

Professional-Grade pH Measurement with the pH Meter ST 404

Deliver precise, repeatable pH analysis for laboratory, industrial, and environmental applications with the pH Meter ST 404—a high-performance benchtop instrument engineered for accuracy, stability, and ease of use. Designed for quality control labs, research facilities, water treatment plants, and food & beverage production, the ST 404 offers ±0.001 pH resolution and ±0.002 pH accuracy, meeting the demands of regulated and data-sensitive workflows.

Engineered for Laboratory Precision and Operational Efficiency

The ST 404 pH Meter features a large, backlit LCD that simultaneously displays pH, mV, temperature, calibration status, and electrode diagnostics. It supports 1–5 point automatic calibration with recognition of standard buffers (pH 1.68 to 12.46) and includes Automatic Temperature Compensation (ATC) via an integrated Pt1000 sensor for accurate readings across 0–100°C. Compatible with standard BNC or DIN electrodes, it works seamlessly with refillable, double-junction, or specialized probes for diverse sample types.

High Accuracy: ±0.002 pH | Resolution: 0.001 pH – Ideal for buffer preparation, titrations, and compliance testing.
Stable Benchtop Design with Electrode Holder – Integrated arm ensures secure, hands-free probe positioning.
GLP-Compliant Data Logging – Stores 1,000+ readings with time, date, user ID, and calibration data; USB output for reports.
Electrode Health Monitoring – Displays slope (%), offset (mV), and response time to flag maintenance needs.
AC-Powered with Low-Noise Circuitry – Eliminates drift during extended measurements.
CE & RoHS Certified – Complies with international safety and environmental standards.

Trusted in Regulated and High-Stakes Environments

From validating pharmaceutical formulations and monitoring wastewater discharge to ensuring consistency in dairy or beverage production, the ST 404 ensures data integrity and method compliance. Its robust construction, intuitive menu system, and audit-ready features make it a reliable choice for ISO 17025, GMP, and HACCP environments.

Whether you’re running daily QC checks or conducting advanced research, the pH Meter ST 404 delivers the precision, stability, and documentation your work demands.

Precision you can trust. Performance built to last.