HI-9812-51 pH EC TDS Temperature Portable Meter

The HI-9812-51 Portable Meter, supplied by GAPS Water Treatment, is your all-in-one solution for water quality analysis. This multi-parameter device streamlines your workflow by accurately measuring pH, electrical conductivity (EC), total dissolved solids (TDS), and temperature—all with a single, robust instrument. Whether in the lab, greenhouse, or field, the HI-9812-51 eliminates the hassle of switching meters and swapping probes for daily water testing, and it is available exclusively through GAPS Water Treatment.

Intuitive Operation and Smart Display

The meter features a large LCD screen which not only displays the current measurement (pH, EC, TDS, or temperature) but also offers tutorial instructions to guide you through calibration and use. The display includes a convenient battery life indicator, so you’re never caught off guard. With straightforward controls and on-screen messages, this device is easy for both beginners and experienced users.

Seamless Switching Between Measurements

Thanks to the HI-1285-51 multiparameter probe, there’s no need to change out electrodes when switching between pH, EC, TDS, or temperature—simply press a button to view the parameter you need. The probe features:

• A durable polypropylene body that stands up to heavy use.
• A gel-filled, maintenance-free pH electrode equipped with an amplifier to protect against electrical noise from common sources such as pumps and motors.
• Amperometric EC/TDS sensors for fast and accurate conductivity and dissolved solids readings.
• An integrated temperature sensor for rapid, automatic temperature compensation of EC and TDS results.

Precise and Reliable Measurements

The HI-9812-51 provides:

• Automatic temperature compensation (ATC) for EC and TDS, with a fixed coefficient (β) of 2%/°C.
• Manual, single-point calibration for both pH (at 7.01) and EC/TDS (at either 1.41 mS/cm or 1500 ppm).
• High resolution and accuracy: 0.1 pH with ±0.1 pH accuracy; 10 µS/cm resolution and ±2% F.S. accuracy for EC; 10 ppm resolution and ±2% F.S. accuracy for TDS.

Its rugged design is complemented by an extended 450-hour battery life (on a single 9V battery), making it perfect for both in-field and routine laboratory work.

Supplied Accessories

Included with the HI-9812-51 kit from GAPS Water Treatment:

• HI-1285-51 multiparameter probe (1m cable)
• HI-70007 pH 7.01 calibration solution sachet
• HI-70031 1413 µS/cm calibration solution sachet
• HI-70032 1382 ppm TDS calibration solution sachet
• 2 x HI-700661 electrode cleaning solution sachets
• 9V battery
• Rugged carrying case
• Comprehensive instruction manual

Optional Accessories: Shockproof rubber boots in Blue (HI-710007) or Orange (HI-710008) are available separately for added protection.

Technical Specifications

The HI-9812-51 Portable Meter, supplied by GAPS Water Treatment, is the smart choice for anyone needing fast, accurate, and hassle-free analysis of pH, EC, TDS, and temperature. With its robust construction, intuitive user interface, and versatile probe, it’s the only meter you’ll need for routine water quality testing. Trust GAPS Water Treatment for reliable results—wherever your work takes you.