VINTAGE IMPERIAL BRASS MFG. ALL IN ONE REFRIGERATOR TEST GAUGE NOS VERY RARE. I BET YOU DON’T HAVE ONE OF THESE. VERY RARE NEW OLD STOCK. IMPERIAL BRASS MFG. Co. 1950 ALL IN ONE REFRIGERATOR CHARGING TESTING UNIT. THIS UNIT IS TOTALLY DIFFERENT FROM THE ORDINARY SINGLE GAUGE TESTING UNIT. AND WILL DO EVERYTHING A DOUBLE GAUGE UNIT WILL DO. IT MAY BE USED ATTACHED TO BOTH SIDES OF THE SYSTEM. OR IT MAY BE USED SEPARATELY ON THE HIGH OR LOW SIDE. COMES IN ORIGINAL BOX WITH INSTRUCTIONS. BOX IS DAMAGED INSTRUCTIONS SHOW AGE FROM STORAGE. WAS WRAPPED IN CHICAGO TRIBUNE NEWSPAPER FROM 1950. SEE PICTURES FOR ALL DETAILS.