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Hanna Instruments Portable Total Hardness Photometer with CAL Check – HI97735

The HI97735 is a compact, waterproof portable photometer designed for accurate measurement of total hardness in water. It measures calcium and magnesium in low, medium, and high ranges, providing a red-violet colorimetric reading proportional to hardness. The meter features an advanced optical system for precision, repeatability, and fast results. A backlit graphic LCD and tutorial mode ensure intuitive operation for field or benchtop use.

  • Stable & High Efficiency LED Light Source for accurate and consistent readings
  • CAL Check Functionality for performance verification and NIST traceable calibration
  • Auto-off Protection after 15 minutes to conserve battery life
  • Large 25 mm cuvette and built-in reaction timer for precise colorimetric measurements

Description

The HI97735 photometer accurately measures total hardness in water, detecting calcium and magnesium levels that indicate potential scaling issues or increased detergent consumption. It covers low (0–250 mg/L), medium (200–500 mg/L), and high (400–750 mg/L) ranges, producing a red-violet hue proportional to hardness. Its innovative optical system, including 8 nm narrowband filters, a concave focusing lens, and reference detector, ensures high accuracy, repeatability, and greater light efficiency. The meter’s backlit dot matrix LCD, virtual keys, and tutorial mode guide users step by step, making operation extremely intuitive.

Designed for field and bench use, the HI97735 is completely waterproof, with a cuvette holder that protects the optical path and a gasketed battery compartment for three AA batteries capable of ~800 measurements. It features stable and efficient LED light sources, CAL Check verification, multiple selectable units (mg/L CaCO3, °f, °dH, °E), built-in reaction timer, and auto-off protection to ensure reliable and repeatable results in any environment. Its compact and ergonomic design allows comfortable handheld or benchtop use.

Features

  • Stable & High Efficiency LED Light Source: Consistent light output with low heat for accurate measurements.
  • Reference Detector: Modulates LED voltage to compensate for power fluctuations and ambient temperature changes.
  • CAL Check Functionality: Verify and calibrate using NIST traceable standards.
  • High Quality Optical Filters: Ensures accurate wavelength, brighter signal, and higher measurement stability.
  • Concave Focusing Lens: Reduces errors from cuvette imperfections and scratches.
  • Large 25 mm Cuvette: Longer path length ensures precise readings, even for low absorbance samples.
  • Built-in Reaction Timer: Guarantees consistent timing for colorimetric measurements.
  • Intuitive Backlit Dot Matrix Display: Virtual keys, battery indicator, error messages, and contextual help.
  • Waterproof Design: Protects cuvette holder and battery compartment, suitable for field and lab use.
  • Auto-off Protection: Shuts off meter after 15 minutes to conserve battery life.
  • Measures Total Hardness in Low, Medium, and High ranges: 0–250, 200–500, 400–750 mg/L CaCO3.
  • Selectable units: mg/L CaCO3, °f, °dH, °E.
  • Compact, ergonomic design for handheld or benchtop use.

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