Hb-Meter Set in Case This a Hb-Meter Set in Case, designed for haemoglobin determination. The case is made of faux-leather patterned black plastic, and features an unglued nameplate with the item's name. The case opens by sliding the T-shaped locking mechanism. The two sides are hinged and upon opening, the internal lid features a white and red instructional label, providing step-by-step guidance on how to use the haemoglobinometer. The numbers in the instructions are shaped like blood teardrops. The label reads: "AO HB Meter for accurate haemoglobin determination. 1. SAMPLE: Drop blood sample directly from finger onto open chamber. 2. HAEMOLYSE: Agitate gently with hemolysis applicator until blood changes to a deep red solution (about 45 seconds). 3. INSERT: Slide chamber containing hemolysed blood under cover glass and insert entire unit into instrument. 4. READ: Press illuminating thumb button, observe through eyepiece, and move lever until both green fields match in intensity. Read finding (use standard size "C" batteries)." The instructions also mention that AO dealers stocked replacement supplies, including chamber clips, cover glass, blood chambers, bulbs, and hemolysis applicators. The label indicates that the device was manufactured by American Optical Company, Instrument Division, Buffalo, NY, 14215, USA. On the opposite side, the red faux-leather plastic tray is designed with compartments to securely house the components of the set. It contains the haemoglobinometer, a chamber clip, two slide chambers, a slot for a missing bulb, and a vial of 100 haemolysis applicators. The haemoglobinometer itself is made of cream-white plastic and is designed to be detachable into two sections. One part contains the lens and sliding scale, which assists in reading haemoglobin levels, while the other houses the thumb button for illumination, as well as the battery and bulb compartment. The engraved black scale on the side provides precise readings when operating the haemoglobinometer. The haemolysis applicators are small pieces of wood shaped like half-toothpicks, contained in a cylindrical tin case with twistable lid on both ends. Additionally, there are two leaflets included in the set. One explains the operation and care of the Hb Meter, while the other contains the directions for use along with a haemoglobin nomogram to help interpret results. This haemoglobinometer set was a compact and efficient tool for medical professionals, allowing for quick and accurate haemoglobin measurement in clinical and field settings. The design, with its integrated lighting, sliding scale, and compact chamber system, made it a valuable instrument in haematology and diagnostics. 1950-1999