HI705 Silica Checker® HC Low Range Colorimeter | 0–2 ppm Silica Meter | Hanna Instruments

HI705 Silica Checker® HC Low Range Colorimeter – Accurate Digital Silica TestingEliminate the frustration of color chart matching with the HI705 Checker® HC handheld colorimeter. This pocket-sized digital tester delivers precise low-range silica measurements (0-2 ppm) with lab-quality accuracy, making it the perfect alternative to subjective chemical test kits for boiler monitoring, reverse osmosis systems, cooling towers, and industrial water quality control.Why Choose HI705 Silica Checker HC? Digital precision – Eliminates subjective color chart interpretation with direct digital silica readings to 0.1 ppm resolution Low range capability – Measures 0.00 to 2.00 ppm silica for sensitive applications where scaling prevention is critical One-button simplicity – Simple operation delivers accurate silica results in minutes, even for first-time users ASTM-adapted method – Uses heteropoly blue method (ASTM D859) for reliable, industry-standard measurements Ultra-portable – Pocket-sized design (3.4" x 2.4" x 1.5") weighs just 2.3 oz for easy field testing Cost-effective accuracy – More accurate than chemical test kits at a fraction of benchtop instrument costs Auto shut-off – Conserves battery with automatic 10-minute power-down Fast results – Get silica readings within minutes without color chart hassle Why Monitor Silica?Silica is found in all natural waters in dissolved form. Due to its potential to cause scaling in boilers, heat exchangers, cooling towers, and reverse osmosis membranes, silica is undesirable and closely monitored in industrial applications, heating systems, and water treatment operations. Even low concentrations can lead to costly equipment damage and reduced efficiency.How It WorksThe HI705 uses an ASTM D859-adapted heteropoly blue colorimetric method where silica reacts with reagents to produce a blue color proportional to silica concentration. The built-in LED light source (610 nm) and silicon photocell detector measure the color intensity and display the precise silica concentration digitally – no color chart matching required.Technical Specifications Specification Detail Model HI705 Range 0.00 to 2.00 ppm (mg/L) silica Resolution 0.1 ppm Accuracy @ 25°C ±0.03 ppm ±5% of reading Testing method ASTM D859 heteropoly blue method Light source LED @ 610 nm Light detector Silicon photocell Battery 1 x 1.5V AAA (included) Auto shut-off After 10 minutes of non-use Operating environment 0 to 50°C (32 to 122°F), RH max 95% non-condensing Dimensions 86.0 x 61.0 x 37.5 mm (3.4" x 2.4" x 1.5") Weight 64 g (2.3 oz) Replacement reagents HI705-25 (25 tests) Calibration check HI705-11 Warranty 1 year Origin Manufactured in Romania by Hanna Instruments ApplicationsEssential for low-range silica monitoring in boiler feedwater and condensate systems, reverse osmosis (RO) and ultrafiltration systems, cooling tower water treatment, steam generation facilities, industrial water quality control, power plant operations, semiconductor manufacturing, pharmaceutical water systems, and educational laboratories. The 0-2 ppm range is ideal for applications where silica scaling prevention is critical to equipment longevity and efficiency.Why Choose a Checker HC Over Test Kits? Eliminates subjectivity – No more squinting at color charts or debating between shades Better accuracy – Digital precision vs. visual estimation Faster results – Direct digital readout saves time Consistent performance – LED light source ensures repeatable measurements regardless of ambient lighting Professional credibility – Lab-quality results for compliance and documentation What's IncludedHI705 Checker® HC colorimeter, 2 sample cuvettes with caps, silica low range reagent starter kit (12 tests), AAA battery, instruction manual, and quick start guide.