Traceable® 4277TR Calibrated pH/ORP Meter

Traceable® 4277TR Calibrated pH/ORP Meter

The Traceable® 4277TR Calibrated pH/ORP Meter is a portable handheld instrument designed for water quality testing, wastewater monitoring, environmental analysis, laboratory applications, and field measurements. Combining pH, oxidation-reduction potential (ORP), and temperature measurement capabilities in a compact, waterproof design, this meter provides accurate readings and convenient data logging for professionals who require reliable testing in both laboratory and field environments.

Key Features

• Measures pH, ORP (mV), and temperature with a single integrated probe
• Includes individually numbered NIST-Traceable calibration certificate with data from an A2LA-accredited ISO/IEC 17025 calibration laboratory
• Stores up to 25 readings with date and time stamps
• IP67-rated waterproof and dustproof construction
• Automatic temperature compensation for improved measurement accuracy
• Supports 1-, 2-, or 3-point pH calibration
• Recognizes both NIST and USA buffer standards
• Compact handheld design for one-handed field operation
• Integrated pH/ORP/temperature probe attaches directly to the meter
• Suitable for wastewater, environmental monitoring, water quality testing, and laboratory analysis
• 1-year warranty

More About This Item

The Traceable® 4277TR provides a convenient all-in-one solution for measuring pH, oxidation-reduction potential, and temperature in a variety of testing applications. Its compact handheld design makes it easy to transport and operate, while the rugged IP67-rated housing protects the instrument from water and dust exposure during field use.

The integrated pH/ORP/temperature probe attaches directly to the meter, creating a portable testing system that can be operated with one hand. For applications requiring greater reach, the probe may be extended using an optional extension cable (sold separately).

Built-in memory stores up to 25 readings along with the date and time each measurement was recorded, enabling users to maintain testing records directly on the instrument. Automatic temperature compensation improves measurement reliability across varying sample temperatures.

The meter supports 1-, 2-, or 3-point calibration procedures and recognizes both NIST and USA pH buffer standards, allowing users to select the calibration method best suited to their testing protocols.

Each instrument includes an individually numbered Traceable® Certificate that documents traceability to SI units through NIST or other recognized National Measurement Institutes (NMIs). The certificate helps support quality assurance programs, accreditation requirements, regulatory compliance, and laboratory documentation. Guaranteed to have at least one year of calibration remaining on the certificate.

Technical Specifications

• Meter Type: Handheld
• Display: LCD
• pH Range: 0.00 to 14.00 pH
• pH Resolution: 0.01 pH
• pH Accuracy: ±0.02 pH
• ORP Range: Up to 1000 mV
• Buffer Recognition: NIST and USA
• Calibration: 1-, 2-, or 3-point
• Temperature Range: 0 to 60°C (32 to 140°F)
• Temperature Resolution: 0.1° from 1 to 100°
• Temperature Accuracy: ±1°C
• Temperature Compensation: Automatic
• Data Logging Capacity: 25 readings with date and time stamp
• Ingress Protection: IP67 waterproof and dustproof
• Battery Type: Two CR2032 lithium batteries
• Battery Life: Approximately 25 hours
• Dimensions (L × W × H): 10.25 × 2.5 × 1 in.
• Probe Diameter: 0.5 in.
• NIST Calibration Included: Yes
• Probe Included: Yes
• Description: Calibrated pH/ORP Meter
• Warranty: 1 year

Included Accessories

• pH/ORP/temperature probe
• Six One-Shot pH calibration buffers
• Hard-sided carrying case
• Two CR2032 lithium batteries
• NIST-traceable calibration certificate with data

Ideal for wastewater treatment facilities, environmental monitoring programs, water quality testing, laboratories, educational institutions, field sampling, aquaculture operations, and industrial process applications requiring portable pH, ORP, and temperature measurement with documented calibration traceability.