????The Sahli hemoglobin meter is a simple, manual device used to estimate hemoglobin concentration in blood. It consists of a graduated glass tube, a mixing pipette, and a color comparator. A blood sample is mixed with a known volume of hydrochloric acid, converting hemoglobin into a brownish-yellow compound called acid hematin. This solution is then compared visually against a standardized color scale in the comparator tube. The matching color indicates the hemoglobin concentration, usually expressed in grams per deciliter (g/dL). Sahli’s method is widely used in clinical laboratories for quick, cost-effective hemoglobin estimation, especially in resource-limited settings