is there a warranty if any type?

We offer a 1 year warranty for this product. The 1 year warranty is not a return and replace it is a return and repair warranty.

why does richey promote a full range micro gauge but doesnt start reading until 250000 microns?

I don't know about the richey gauge. 1 micron is the same as 1 millitorr (0.001 torr). Torr is defined as 1/760 of standard atmosphere; therefore, one atmosphere = 760 torr (760000 micron). This yellow jacket gauge does read up to 760000 micron. The truth is that almost any vacuum device (even a water aspirator) will produce a lower vacuum than 250000 micron. Perhaps that is why richey says their gauge is full range even though it maxes out at 250000 micron.

Does this come with nist certification?

Not sure about NIST certification but it does work well and the one we have used in our company for a long time.

Does this unit use standard agilent 531 type thermocouple sensors? are they plug and play with other 531 sensors?

I do not think this would go onto a sensor thermo couple best way found to use is installed in line with gauge service hose and make sure you have a shut off valve where service line goes to your vacuum pump. Hope this helps

Product Dimensions	13 x 13 x 5 inches
Item Weight	2 pounds
Manufacturer	RITCHIE
ASIN	B004I52IGC
Item model number	69075
Is Discontinued By Manufacturer	No
Date First Available	February 22, 2008

SUPEREVAC LCD VACUUM GAUGE

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