Checker®HC Handheld Colorimeter – Alkalinity
- Easier to use and more accurate than chemical test kits
Accuracy ±5 ppm ±5% of reading
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
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
- Ideal for Saltwater Aquariums
The HANNA HI 755 Checker®HC bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate and have low 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.
The Checker®HC features an accuracy of ±5 ppm (mg/L) ±5% of reading 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 gently invert 5 times. Then insert the cuvette into the HI 755 Checker®HC and press the button to read the results. It’s that easy.
HI 755 Checker®HC is supplied with (2) sample cuvettes with caps, liquid reagents for alkalinity (25 tests approx.), syringe with tip, battery and instructions.
|Range||0 to 300 ppm (mg/L)|
|Resolution||1 ppm (mg/L)|
|Accuracy @ 25°C||±5 ppm (mg/L) ±5% of reading|
|Battery Type||(1) 1.5V AAA|
|Light Source||LED @ 610 nm|
|Light Detector||silicon photocell|
|Environment||0 to 50°C (32 to 122°F); RH max 95% non-condensing|
|Auto-off||after two minutes of non-use|
|Dimensions||81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)|
|Weight||64 g (2.25 oz.)|
Free Chlorine Test Kit
Free chlorine reacts with ammonium ions and organic compounds to form chlorine compounds resulting in diminished disinfecting capabilities compared with free chlorine. These chlorine compounds together with chloramines form combined chlorine. Combined chlorine and excess free chlorine together result in total chlorine. While free chlorine has a much higher disinfectant potential, combined chlorine has a much higher stability and has a lesser volatility. There should be sufficient levels of unreacted free chlorine for adequate disinfection, but not so much as to become harmful.
HI 38018 test kit comes with HI 93701-0 free chlorine reagent (200 packets), demineralizer bottle with cap for 12 L, checker disc, glass vials with caps (2) and 3 mL plastic pipettes.
Method Checker Disc
Range 0.00-0.70 mg/L
Smallest Increment 0.02 mg/L
Chemical Method DPD
Number of Tests 200
Weight 647 g