Pocket pH Tester

The Pen Meter (DPH1) is a pocket-sized, single-parameter pen tester measuring pH (-2.00 to 16.00) with ±0.01 pH ±1 digit accuracy and 0.1/0.01 resolution, featuring replaceable combined electrode design (DPH1-S), multi-color backlit LCD display with reading stability indicator and automatic data lock, IP67 dustproof and waterproof rating, 0 to 60 degrees Celsius temperature measurement with ±0.2 degrees Celsius accuracy, automatic temperature compensation (ATC), 1 to 3 point automatic pH calibration with buffer recognition, support for CH, USA, and NIST standard buffer solutions, low battery indicator, user-configurable automatic shut-off and backlight duration, power-on self-diagnosis, and complete field-ready kit including hard carrying case (28.0 × 23.0 × 8.2 centimeters), pH buffers (pH 4.00, 6.86, and 9.18, 30 mL each), 3 mol KCl electrode storage solution (10 mL), sample vials (30 mL × 3), four AAA batteries, and lanyard—ideal for water quality testing in clinical, pharmaceutical, and environmental applications .

The Pen Meter (DPH1) can also measure oxidation-reduction potential (ORP) by simply adding the optional DORP1-S ORP electrode, extending the instrument's utility for disinfection efficacy monitoring in water treatment systems .

For the dialysis technician, water quality specialist, clinical laboratory scientist, and pharmaceutical QC chemist, the Pen Meter (DPH1) enables rapid, on-site pH measurement of biological fluids (serum, plasma, urine, cerebrospinal fluid) for metabolic assessment, purified water systems, dialysis fluids, and pharmaceutical process water—critical parameters for ensuring patient safety during renal replacement therapy, diagnosing acid-base disorders, and supporting drug manufacturing .

Key features include multi-color backlit display with reading stability indicator and automatic data lock when stable (smiley icon), power-on self-diagnosis function, low battery indicator, user-configurable automatic shut-off time and backlight duration, replaceable electrode design for extended instrument life, and compatibility with CH, USA, and NIST calibration standards . The IP67 dustproof and waterproof rating ensures reliable operation in harsh field environments, while the complete accessory kit provides field-ready capability .

The replaceable DPH1-S electrode is pre-installed in new meters and is available as a replacement part, extending instrument service life—electrode replacement rather than complete meter replacement . The electrode must be stored with the pH sensing bulb moist using 3 mol KCl storage solution to prevent drying .

For the patient, accurate pH monitoring of water used in dialysis and pharmaceutical manufacturing ensures that critical treatment fluids meet stringent safety and quality standards—preventing potential harm from improperly treated water and supporting the production of safe, effective medications. Additionally, pH measurement of biological fluids supports early detection of metabolic disturbances, acid-base imbalances, and renal dysfunction—enabling timely clinical intervention.