Siemens 547-002 Differential Pressure Monitor Without Key switch Pre owned/ normal wear/ Untested/ We were told this was pulled from working environment but cannot test any further so we are selling as is/ item pictured is the exact item you will receive We are wholesaler/liquidators. We bought this in a lot of new items to resell. Our knowledge of this item is very limited. We are counting upon you to know what you are buying and if this item will suit your needs. This is being sold AS-IS. No returns. Please only purchase this if you agree to those terms. *** PLEASE NOTE! Our store buys and sells a variety of new and used electronics, instruments, tools, antiques and many other items. We do our absolute best to thoroughly test all our merchandise and accurately describe and depict any flaw or defect we find. Unfortunately, we do come across items that are outside of our wheelhouse where we cannot properly test them. These items we list AS-IS for parts. It does not mean that they don't work, just that we cannot test them. SHELF: FA-C SA