CheckerHC - Model HI 739 -Handheld Colorimeter - Fluoride High Range
Fluoride is one of the very few chemicals that have been shown to cause significant effects in people through drinking-water. Fluoride has beneficial effects on teeth at low concentrations in drinking-water, but excessive exposure to fluoride in drinking-water, or in combination with exposure to fluoride from other sources, can give rise to a number of adverse effects.
Water fluoridation is the controlled addition of fluoride to a public water supply to reduce tooth decay. Fluoridated water operates on tooth surfaces: in the mouth it creates low levels of fluoride in saliva, which reduces the rate at which tooth enamel demineralizes and increases the rate at which it remineralizes in the early stages of cavities.
A 1994 World Health Organization expert committee suggested a level of fluoride from 0.5 to 1.0 mg/L, depending on climate. Bottled water typically has unknown fluoride levels, and some domestic water filters remove some or all fluoride.
The HI 739 Checker®HC is simple to use. In one vial add 2 ml of Reagent A and 8 ml of Reagent B; gently invert 5 times, and wait 1 minute, then zero the instrument with the vial. After zeroing, remove the vial and add 1 ml of sample, gently invert 5 times, wait 1 minute, then insert the cuvette into the HI 739 Checker®HC and press the read button for results.
Easier to use and more accurate than chemical test kits
SPADNS method
±0.5 ppm ± 5% of reading accuracy
Large, easy to read digits
Auto shut off
Dedicated to a single parameter
Designed to work with HANNA’s reagents
Uses 10 mL glass cuvettes
Small size, big convenience
Weighing a mere 64 g (2.25 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
Range: 0.0 to 20.0 ppm
Resolution: 0.1 ppm
Accuracy @ 25°C: ±0.5 ppm ± 5% of reading
Light Source: LED @ 575 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 two minutes of non-use and ten seconds after reading
Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
Weight: 64 g (2.25 oz.)
Method: adaptation of SPADNS method