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HANNA Silica Low Range Handheld Colorimeter


The HI-705 handheld checker is a simple, accurate, and cost effective way to measure low ranges of silica. Designed as a more accurate alternative to chemical test kits, the HI-705 provides quick, accurate results in four easy steps.

The HI-705 uses an adaptation of the ASTM D859 method of heteropoly blue method. The reaction between silica and reagents causes a blue tint in the sample.


  • Small palm-sized design
  • Accurate from ±0.03ppm ± 5% of reading
  • Dedicated to a single parameter
  • Uses a single AAA battery
  • Auto Power Off after 10 minutes in inactivity
  • Built-in timer for timed reaction readings

Ideal for:

  • Water Quality
  • Education
  • Environmental
  • Water Treatment (Boilers/Cooling Towers)

Order Information:

The HI-705 Checker is supplied with 2 cuvettes and caps, reagent starter kit x 12 tests (re-ordering information: HI-705-25 x 25 tests), 1 x 1.5V AAA battery, and an instruction manual.

Also available: HI-705-11 Calibration set

Four steps. One click. Instant Readout.

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

2. Take 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 Calibration Check Set HI-705-11 with the HI-705 Silica Low Range Handheld Colorimeter - Checker®HC.

Use Reagents HI-705-25 with the HI-705 Silica Low Range Handheld Colorimeter - Checker®HC, 25 tests.


Specifications list


Range 0.00 to 2.00 ppm
Resolution 0.01 ppm
Accuracy (@25°C/77°F) ±0.03ppm ± 5% of reading
Measurement Method Colorimetric
Light Source Photodiode @610 nm
Method Adaptation of the ASTM D859 method of heteropoly blue method
Light Detector Silicon photocell
Power Supply Auto off after 10 min. of inactivity
Environment Environment 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Dimensions 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”)
Weight 64 g (2.25 oz.)