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Hanna Instruments HI 755 Checker HC Salt Water Alkalinity Photometer HI755

Hanna Instruments

  • $ 4410

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Item Description: Brand New Hanna Instruments HI 755 Checker®HC Alkalinity Photometer 0-300ppm(mg/l) 


Hanna HI 755 Checker Colorimeter/Photometer SPECS:.

SPECIFICATIONS          HI 755 (Alkalinity)                 

Range                             0 to 300 ppm (mg/L)             

Resolution:                      1 ppm (mg/L)
Accuracy:                        +/-5% of reading ±5 ppm (mg/L) @ 25°C
Light Source:                   LED @ 610 nm
Light Detector:                 Silicon photocell
Environment:                   0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type:                   (1) 1.5V AAA
Auto-off:                           After 2 minutes of non-use and after read
Dimensions                     81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
Weight:                            64 g (2.25 oz.)
Method:                           Colormetric Method

Hanna HI 755 Checker Colormeter/Photometer is supplied with:

  • (2) sample cuvettes with caps
  • (1) 30ml Bottle of HI 755-26 LIQUID reagent - Enough for 25 tests 
  • (1) Sample Syringe
  • (1) 1.5V AAA
  • battery and instructions.

Hanna HI 755 Checker Colorimeter/Photometer FEATURES:

  • Ideal for: Marine Habitats
  • Easier to use and more accurate than chemical test kits
  • Colormetric Method
  • Accuracy +/- 5% ±5 ppm (mg/L) at 25'C
  • 1 ppm (mg/L) resolution
  • Large, easy to read digits
  • Auto shut-off
  • Dedicated to a single parameter
  • Designed to work with HANNA’s LIQUID reagents (HI 755-26) - THE HI 755-25 POWDER REAGENTS HAVE BEEN RECALLED IN FALL, 2010
  • Uses 10 mL glass cuvettes
  • Small Size, Big Convenience
  • Weighing a mere 65 g (2.3 oz.), the Checker®HC easily fits into the palm of your hand or pocket.
  • Use for quick and accurate on the spot analysis.
  • Single button operation: Zero and Measure
  • Operated by a single AAA battery



OK, it's MADE specifically for Marine Habitats!

Alkalinity is one of the most important parameters to measure in salt water aquaria. It helps maintain a stable pH, an important factor for most aquatic life.

In seawater, bicarbonate is by far the largest contributor to alkalinity. Alkalinity is measured instead of bicarbonate levels, which are otherwise quite difficult to determine. Bicarbonate is a critical element, as corals must have a ready supply of carbonate and bicarbonate to form their skeletons. Without an adequate level of alkalinity, therefore, healthy coral growth is not possible. The alkalinity of natural seawater is typically 125 ppm CaCO3 equivalents (7 dKH). The generally accepted alkalinity range in marine aquaria is 125 – 200 ppm CaCO3 equivalents (7 - 11 dKH). Some corals may benefit from even higher alkalinity levels; however, at high alkalinity, calcium will precipitate out as calcium carbonate, an undesirable outcome.

The HANNA HI 755 Checker®HC bridges the gap between simple chemical test kits and professionalinstrumentation. Chemical test kits are not very accurate and only give 5 to 10 points resolution while professional instrumentation can cost hundreds of dollars and can be time consuming to calibrate and maintain. The HANNA HI 755 Checker®HC is accurate and affordable.

This Checker®HC features an accuracy of ±5% of reading ±5 ppm and uses the colorimetric method.

The contoured style of this Checker®HC fits in your palm and pocket perfectly and the large LCD is easy to read. The auto shut-off feature assures the battery life will not be drained if you forget to turn it off.  The HI 755 Checker®HC is extremely simple to use.  After zeroing the instrument with your water sample, add the reagent to the cuvette and shake. Then insert the cuvette into the HI 755 Checker®HC and start the timer. Invert the cuvette when prompted and press the button to read the results. It’s that easy.


HI 731318 Tissue for Wiping Cuvets
HI 731331 Glass Cuvet for HI 957xx Series Meters
HI 731353 Caps for cuveettes
HI 93703-50 Solution for Cleaning Cuvets
Reagents & Standards
HI 755-25

Powder Reagents for 25 test (Alkalinity) - DISCONTINUED IN THE FALL OF 2010 DUE TO INACCURACY ISSUES

HI 755-26                                     LIQUID Reagents TO REPLACE THE HI 755-25 POWDER REAGENTS - NOW COMES STANDARD WITH THE HI 755!  30ml Bottle

Here's some of the Hanna Literature:, UPDATED MANUAL:


S&H within the USA (and it's territories) is a flat rate  via USPS.

International S&H is $12.00 to Canada and $15.00 to the rest of the world!

National Industrial Supply
30777 Rancho California #891420
Temecula, CA 92589, USA
Sales: 951.308.9269
Fax: 310.833.7306  

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