These are from SPX TIF, Model 3310 from the best name in the business. HVAC (Heating, Ventilation, Air Conditioning) differential thermometer tester. This does not include an infrared thermometer, that is the 3320 set.  The pictures have the details of the item.  TIF/SPX is a well known brand and builds quality products.  It is new in box.  Brand new item purchased directly from the manufacturer.  Comparable models go for $100+.  We will not sell to bidders without feedback, we had a couple of bad experiences.  Thanks.