See page10.166 for Checker HC accessories HI780 Marine pH Handheld Colorimeter • Easier to use and more accurate than chemical test kits • Dedicated to a single parameter • Small size, big convenience pH of ocean surface water is normally 7.5 to 8.5 pH. Over the years however, acidi¡cation tendency is to decrease 0.1 to 0.2 pH units/ century. Acidi¡cation is a consequence of carbon dioxide (COº) absorbtion in seawaters and oceans. Carbon dioxide reacts with seawater to produce carbonic acid (HºCO²). pH modi¡cations aect marine life growth, reproduction, and communication. Hydrogen ions have a tendency to bond with carbonate to form bicarbonate. The greater attraction to carbonate over calcium can adversely aect skeleton building and can limit coral growth. The HI780 Checker HC is a simple, accurate, and cost eective way to measure pH in seawater. Designed as a more accurate alternative to chemical test kits, this handheld colorimeter provides quick, accurate pH testing results. Specifications HI780 Range 6.3 to 8.6 pH Resolution 0.1 pH Accuracy 0.2 pH of reading @ 25 °C (77 °F) Light Source Light Emitting Diode @ 525 nm Light Detector Silicon photocell Method Colorimetric Adaptation of Phenol Red Method Environment 0 to 50 °C (32 to 122 °F); max. 95% RH non-condensing Battery Type 1.5V AAA Alkaline Auto-off After 10 minutes of non-use Dimensions 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”) Weight 64 g (2.3 oz) Ordering Information HI780 Checker HC is supplied with sample cuvette and cap (2 pcs.), Marine pH reagent starter kit, 1.5V AAA Alkaline battery (1 pc.), and instruction manual. Reagent Set HI780-25 Reagents for approximately 100 Marine pH tests Calibration Set HI780-11 Marine pH certified standard kit www.hannainst.com | 10 10.161 Photometers Checker®HC
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