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Hanna Instruments – HI991003 Waterproof Portable pH/pH-mV/ORP/Temperature Meter with Sensor Check™

The HI991003 Waterproof Portable pH/pH-mV/ORP/Temperature Meter is a compact, highly durable instrument designed for field and laboratory use. It features IP67 waterproof protection and can withstand harsh environments. Equipped with the HI12973 titanium body pH/ORP electrode with built-in temperature sensor, the meter provides accurate, automatically temperature-compensated readings. Advanced functionalities like Sensor Check™, automatic calibration, buffer recognition, and stability indicators make this meter reliable, easy to operate, and suitable for professional applications.

  • IP67 Waterproof & Rugged Design – Safe for wet conditions and outdoor use
  • HI12973 Titanium Body pH/ORP Electrode – Pre-amplified, built-in temperature sensor, quick connect DIN, cloth junction with gel electrolyte
  • Sensor Check™ & Automatic Calibration – Ensures electrode diagnostics, buffer identification, and precise temperature compensation
  • Multi-Parameter Display & HOLD Functionality – Simultaneously shows pH, pH-mV, ORP, and temperature; readings can be frozen for recording

Description

The HI991003 meter is engineered for professionals who require accuracy, reliability, and durability in any environment. Its large multi-level LCD displays pH, pH-mV, ORP, and temperature readings simultaneously, with 0.01 pH resolution and ± 0.02 pH accuracy. Automatic two-point calibration with selectable buffer sets, on-screen calibration instructions, and stability indicators ensure precise and repeatable measurements. The IP67 waterproof casingprotects the meter from immersion, rain, and splashes, making it ideal for fieldwork or harsh lab conditions.

The included HI12973 pH/ORP electrode combines a titanium body with a spherical general-purpose glass bulb, pre-amplifier, cloth junction with gel electrolyte, and a quick connect DIN connector for secure, waterproof connection. Its titanium body provides chemical and electrostatic resistance while the matching pin design eliminates ground loops, ensuring highly accurate readings. The Sensor Check™ function evaluates the probe condition and alerts the user to maintenance needs or potential issues during calibration. With automatic temperature compensation, battery level indicators, and HOLD functionality, the HI991003 delivers professional-grade performance in a portable, user-friendly package.

Features

  • IP67 Waterproof & Rugged Design: Safe for immersion, wet environments, and outdoor fieldwork.
  • HI12973 Titanium Body pH/ORP Electrode: Pre-amplified, built-in temperature sensor, spherical GP glass bulb, cloth junction with gel electrolyte, and quick connect DIN connector for waterproof, reliable readings.
  • Sensor Check™ & Automatic Calibration: Monitors electrode condition, provides buffer identification, and enables precise one or two-point calibration with automatic temperature compensation.
  • Multi-Parameter LCD Display: Simultaneously shows pH, pH-mV, ORP, and temperature readings with 0.01 pH resolution.
  • HOLD & Stability Indicators: Freeze readings for recording, with on-screen indicators for calibration stability.
  • Battery Life & Auto-Shutoff: User-selectable auto-off with 1.5V AAA batteries providing ~1400 hours of continuous use.
  • Compact & Portable: Lightweight 196 g (6.91 oz.) with rugged thermoformed carrying case included.

Specifications

SKU HI991003
Product Name Waterproof Portable pH/pH-mV/ORP/Temperature Meter with Sensor Check™ – HI991003
Quote Required Yes
pH Range -2.00 to 16.00 pH; -2.0 to 16.0 pH
pH Resolution 0.01 pH; 0.1 pH
pH Accuracy ±0.02 pH; ±0.1 pH
pH Calibration automatic, at one or two points with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
pH Temperature Compensation automatic ‐5.0 to 105.0 °C/23.0 to 221.0 °F
pH CAL Check (electrode diagnostics) probe condition indicator
pH Sensor Check yes
ORP Range ±1999 mV (ORP)
ORP Resolution 1 mV (ORP)
ORP Accuracy ±2 mV (ORP) ±0.5 °C up to 60 °C
±1.0 °C outside ±1.0 °F up to 140 °F
±2.0 °F outside
mV Range ±825 mV (pH‐mV)
mV Resolution 1 mV (pH‐mV)
mV Accuracy ±1 mV (pH‐mV)
Temperature Range -5.0 to 105.0°C / 23.0 to 221.0°F
Temperature Resolution 0.1°C / 0.1°F
Temperature Accuracy ±0.5°C (up to 60°C); ±1.0°C (outside) / ±1°F (up to 140°F); ±2.0°F (outside)
pH/ORP Electrode HI12973 pre-amplified pH/ORP probe with internal temperature sensor, quick connect DIN connector and 1 m (3.3’) cable (included)
Automatic Shut-Off user selectable
Battery Type/Life 1.5V (3) AAA / approximately 1400 hours of continuous use
IP Protection IP67
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
Weight 196
Ordering Information HI991003 is supplied with HI12973 pH/ORP probe with internal temperature sensor, HI70004 pH 4.01 buffer sachet (20 mL x 1), HI70007 pH 7.01 buffer sachet (20 mLx 1), HI700601 electrode cleaning solution sachet (2 x 20 mL), 100 mL beaker, batteries, calibration certificates for both meter and probe, instructions, and rugged thermoformed carrying case.

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