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HANNA Silica High Range Handheld Colorimeter


The HI-770 pocket checker is a simple and accurate way to measure high ranges of silica.

The HI-770 Checker for High Range Silica is simple to use following the steps detailed below:

Key features

  • Accurate and easy to use
  • Adaptation of EPA Diazotization method
  • ±2 ppm ±5% of reading accuracy
  • 1 ppm resolution
  • Designed to work with Hanna reagents
  • Large easy to read digits
  • Auto shut-off

Ideal for


  • Aquaculture
  • Quick on the spot analysis
  • Routine water quality testing - Environmental & water treatment

Supplied with

  • 2 sample cuvettes with caps
  • Reagents for 6 tests (re-ordering information HI-770-25 x 25 tests)
  • 1 x 1.5V AAA battery
  • Instructions

Also available: HI-770-11 Calibration set

Silica testing in aquariums

Soluble silica molecules are important to aquaculture because they influence (and limit) the growth of diatoms. While diatoms consume CO2 and release pure oxygen (thus improving DO levels) leaving it clearer and your fish and coral healthier, it is important to limit diatoms growth. Silica also improves the health and growth of organisms such as sponges and mollusks.

Four steps. One click. Instant Readout.

1. ‘Zero’ the Checker®HC with your vial & 10ml water sample inside

2. Take the vial out and add your reagent

3. Place your vial into your Checker®HC

4. Press the button and read the results

Battery powered – Allows use away from a power source. Batteries are included with all battery operated products.

Use HI-770-25 Reagents for Silica HR Handheld Colorimeter, Checker®HC, x 25 tests.

Use HI-770-11 Calibration Check Set for HI-770 Silica HR Handheld Colorimeter, Checker®HC.


Specifications list


Range 0 to 200 ppm
Resolution 1 ppm
Accuracy @ 20°C ±2 ppm ±5% of reading
Light Source LED @ 470 nm
Light Detector silicon photocell
Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Battery Type 1.5V AAA
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.)
Method adaptation of the USEPA METHOD 370.1 for drinking, surface and saline waters, domestic and industrial wastes and Standard Method 4500-SiO2 C