

For the three month ended March 31, 2019	U.S. Operations		Swiss Operations		Western European Operations		Chinese Operations		Other Operations		Total
Product Revenue	$	174,256	$	26,665	$	116,555	$	111,416	$	95,455	$	524,347
Service Revenue:
Point in time	49,651		4,951		33,939		7,704		24,018		120,263
Over time	10,743		1,961		15,412		2,603		4,123		34,842
Total	$	234,650	$	33,577	$	165,906	$	121,723	$	123,596	$	679,452



For the three month ended March 31, 2018	U.S. Operations		Swiss Operations		Western European Operations		Chinese Operations		Other Operations		Total
Product Revenue	$	172,501	$	25,565	$	116,932	$	104,292	$	91,656	$	510,946
Service Revenue:
Point in time	47,619		4,830		34,590		7,127		24,237		118,403
Over time	9,625		2,071		13,850		2,511		3,415		31,472
Total	$	229,745	$	32,466	$	165,372	$	113,930	$	119,308	$	660,821

In certain circumstances, our reporting units sell directly into other geographies. A breakdown of net sales to external customers by geographic customer destination for the three months ended March 31 follows:



	2019		2018
Americas	$	258,631	$	252,279
Europe	209,555		205,840
Asia / Rest of World	211,266		202,702
Total	$	679,452	$	660,821

The Company's global revenue mix by product category is laboratory (53% of sales), industrial (40% of sales) and retail (7% of sales). The Company's product revenue by reportable segment is proportionately similar to the Company's global mix except the Company's Swiss Operations is largely comprised of laboratory products, while the Company's Chinese Operations has a slightly higher percentage of industrial products. A breakdown of the Company’s sales by product category for the three months ended March 31 follows:



	2019		2018
Laboratory	$	359,732	$	345,159
Industrial	271,320		262,656
Retail	48,400		53,006
Total	$	679,452	$	660,821