[METRIC]
A-A-50802A
22 June 1992
SUPERSEDING
A-A-50802
17 April 1981
COMMERCIAL ITEM DESCRIPTION
COUNTER, BLOOD CELLS, DIFFERENTIAL
The General Services Administration has authorized the use of this Commercial Item Description.
This Commercial Item Description covers an eight unit differential blood cell counter with totalizer, suitable for use in routine white blood cell counts.
Salient characteristics:
The counter shall be a manually operated, automatic combination adding machine and percentage calculator consisting of eight counting units, each independently operated by a key and joined together in a line. The counter shall have individual amount windows for each key, a totalizer, a device which audibly signals the totalizer counting of each 100 key depressions, a removable blood cell chart, and a reset device.
The individual amount windows shall be oriented in the counter housing such as to be read when placed on a table while an operator is sitting or standing. As viewed by the operator, the windows shall register to 9, 9, 9, 99, 999, 99 and 99 respectively. As an alternate, each window may register to 999. The number of times each individual key is depressed shall register independently in its amount window. A single complete stroke on each key shall result in an accurate count without any evidence of double counting, skipping or coasting. The totals of the individual keys shall automatically record percentages when a total of 100 cells or multiplies of 100 cells have been counted.
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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