LED light source and silicon photocell ensure precise, colorimeter-style measurement
Auto shut-off conserves battery life by powering down after ten minutes of inactivity
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Calcium Checker - HI758
The Hanna Marine Calcium Checker bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits have limited accuracy and resolution since they rely upon the human eye to discern differences in colour. Professional instrumentation incorporates a light source such as an LED or
