The document describes the Water Lead Content Detector Model ACM-158-SC, which is an economical single element lead concentration meter used to quantitatively detect lead content in liquid samples. It works with reagents to form colored compounds when electromagnetic waves are absorbed, which are detected by a silicon light source, lens, color bottles, and photocell. The signal processor displays lead levels on an LCD meter. It has a measuring range of 0.5-3.00 mg/L, uses the DPD method, and takes 3 minutes for analysis with features like no moving parts, high sensitivity, and low power consumption from a 9V battery.