The document describes a Water Chromium Content Detector model 174-SC. It uses colorimetric analysis with a reagent to detect chromium levels in liquid samples between 5.00-30.0 mg/L. The detector has a silicon light source, lens, color bottles, and photocell to analyze samples in 3 minutes. It has features like no moving parts, high sensitivity, low power consumption using a 9V battery for over 40 hours, and small size. The detector is used to analyze chromium levels in various types of water and other analytical applications.