UNICO Differential Counters have been time tested for decades in the clinical laboratory. The L-BC3 is a 2-key CSF differential counter featuring the 2 keys. The L-BC6 is a 5-key manual differential counter featuring the 5 keys and totalizer window. The most popular model is the L-BC9. It features 8 keys with totalizer window. Housing is durable, chemical resistant and easy to clan and desinfect; full white blood cell maturation strip chart; dual reset knobs; wide base with rubber feet for stable use; and signal bell (when total of 100 cells have been counted).