Hanna Color Grading Kit
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Hanna Digital Color Grader

(1 customer review)



  • HI759 Checker®
  • (3) Sample Cuvettes with Caps
  • Sealed Glycerol Reference Cuvette
  • (3) Plastic Beakers
  • Battery
  • Instructions
  • Quick Start Guide


Bundling Discount Available

Hanna Glass Cuvettes with Plastic Inserts

The HI731359 are the replacement glass cuvettes used with the HI759 Maple Syrup Digital Grader. This kit is not only ideal for sizable sugar houses who grade multiple samples per day, but also for those who wish to store graded samples throughout the season.
  • Optically clear glass
  • 10 mL level mark for adding correct volume
  • Durable plastic inserts for storage


  • 25 round glass cuvettes that are optically clear and hold 10 mL of sample
  • 25 durable plastic inserts that fit inside each cuvette opening


The season of maple syrup production spans several months between winter and spring each year. As the days get warmer and the nights stay below freezing, the sap from maple trees begins to flow and tapping begins. At the beginning of production season, the sap produces a lighter, sweeter syrup comprised of sucrose as the main sugar content. As the season progresses and temperatures rise, microorganisms grow and colonize the sap as it is collected. These bacteria, while not harmful, convert part of the sucrose present into invert sugars, glucose and fructose. The level of invert sugars in the sap, as well as the chemical processes that occur during boiling, are responsible for creating a darker and stronger flavored syrup product.

Maple syrup grading standards for the United States and Canada are identical, allowing consumers to easily distinguish between the different grades of syrup, regardless of the place of origin. Grade A maple syrup is classified into four distinct categories:

Range (% Transmittance) USDA and State of Vermont Grades and Standards (New IMSI* Standards)
75.0 to 100.0 Grade A
Golden Color / Delicate Taste
50.0 to 74.9 Grade A
Amber Color / Rich Taste
25.0 to 49.9 Grade A
Dark Color / Robust Taste
Less than 25.0 Grade A
Very Dark Color / Strong Taste

The HI759 Maple Syrup Digital Grader is a handheld colorimeter designed for quick, accurate determination of Grade A maple syrup. The HI759 is designed as a more accurate alternative to temporary and permanent visual grading kits, providing quick, accurate results in four easy steps.

Step One – Add a sample to the included cuvette(s). Step Two – Insert the glycerol reference cuvette, close the lid, and press the button to zero. Step Three – Remove the glycerol reference cuvette and replace with a sample cuvette. Step Four– Close the lid and press the button. Reading will be taken automatically and the results displayed in percent light transmittance.

This Maple Syrup Digital Grader measures the light transmittance of the syrup and directly displays the percentage results on the large, easy to read LCD display. Located on the back of the meter is a chart referencing the percent light transmittance to the grade. Eliminating the subjectivity of grading by eye and the potential for mislabeling, the HI759 is grading made simple.

Features at-a-glance:

  • Easier to use and more accurate than visual grading kits
  • Small size, big convenience
  • Ideal for maple syrup producers and packers


Range 0 to 100% transmittance
Resolution 1% transmittance
Accuracy @ 25°C/77°F ±4% transmittance
Light Source LED @ 560 nm
Light Detector silicon photocell
Method adaptation of the USDA maple syrup standard
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type (1) 1.5V AAA
Auto-off after ten minutes of non-use
Dimensions 86.0 mm x 61.0 mm x 37.5 mm (3.4″ x 2.4″ x 1.5″)
Weight 64 g (2.25 oz.)
Ordering Information HI759 Checker® is supplied with (3) sample cuvettes with caps, sealed glycerol reference cuvette, (3) plastic beakers, battery, instructions, and quick start guide.
Warranty 1 year


The Glycerol reference sample has a life expectancy of about 2 years. Replacement sets of Glycerol Reference Samples are available.

Hanna® Tech Support

1 review for Hanna Digital Color Grader

  1. Eric Bellville Ohio

    This is a must have in the sugar house. It is the simplest tool to use in the sugar house. It takes the guessing out of your syrup grade.

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