Traceable® pH/ORP Meter

  • Compact instrument fits in the palm of your hand.
  • Accuracy: ±0.02 pH
  • 25 point memory storage  with time/date stamp
  • Waterproof (IP67)
  • Triple Display shows pH or ORP measurement, temperature and time\date.
  • Ideal for wastewater, water quality and environmental applications.



pH Range 0.00 to 14.00 pH units
pH Resolution 0.01 pH units
pH Accuracy ±0.02 pH units
ORP Range -1800 to 1800 mV
ORP Resolution 0.1mV <1000mV (1mV ≥1000mV)
ORP Accuracy ±20 mV
Probe Temperature Range 0 to 60ºC or 32 to 140 ºF (selectable)
Temperature Resolution 0.1º (1º when >100º)
Temperature Accuracy ±1ºC
Standard Electrode Polycarbonate body housing, 12mm diameter, 4.4”/111mm length, single-junction gelled Ag/AgCl reference (sealed) with ceramic pin/pellon junction, ASI type VIII glass, full range pH sensor, 0.095” Platinum disc ORP sensor, and integral thermistor. Also Inc
Operating Range 0-60ºC
Power Requirements 2x CR2032 3V Batteries (included)
Battery Life >25 Hours Typical (without use of back-lighting)
Battery Saver Feat After 8 minutes of non-use, low battery indicator at <10% remaining
Dimensions 10.25 inch (26 cm) x 2.5 inch (6.4 cm) x 1 inch (2.5 cm)
Weight Weight: 4.5 ounces /(127 grams)
Calibration User-selected 1, 2 or 3-point calibration
Automatic Buffer Recognition User-selected standard buffer sets: USA 4.01 / 7.00 / 10.01 or NIST 4.01 / 6.86 / 9.18

SKU 4277 Categories , , , ,


Compact instrument fits in the palm of your hand making single-handed operation a breeze. Designed for your water applications, the highly-accurate Traceable® pH/ORP/Temperature Meter takes the guesswork out of measurements.  This unit is ideal for testing pH and ORP in wastewater, water quality and environmental applications.

Trust your measurements – store all calibrations in the probe.  Guided calibration and check standard routines reduce calibration errors. Stabilization alerts and visual measurement lock ensure that you can trust the accuracy of the results.

Rugged, waterproof (IP67) meter provides worry-free, reliable operation in lab or field environments.

Convenient kit includes everything you need to start testing – batteries, user guide, carrying case, ISO 17034 (formerly ISO Guide 34) CRM pH buffers and Traceable® Certificate


To assure accuracy an individually serial-numbered Traceable® Certificate is provided from our ISO/IEC 17025 (1750.01) calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology).


Cat. No. 4277 Traceable® pH\ORP Meter

Cat. No. 4278 Probe Extension Cable

Cat. No. 4279 Replacement Probe

Cat. No. 4290 Traceable® One-Shot ™ pH Buffer Standards (CRM) 6-Pack Assortment

Additional information

Weight 0.28 lbs

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