Given to me and I have no clue on its use. Might be a handy tool for testing batteries on all the new electric motor vehicles that are being now produced. This is a vintage U.S. Army Battery Tester model TS-183B/U. An very interesting military collector’s item and in great condition. Comes with a 1965 technical test data sheet from the Department of the Army, Washington DC. The case is built like a tank. Maybe convert to an ammo box with alterations? Have two Manuals on disc with schematics. parts list, pictorials, and operational use. Index from one of the Manuals below. PART ONE. INTRODUCTION. Section I. Description of Battery Tester TS-183/U. Paragraph Page General 1 1 1 Application 2 I Technical characteristics 3 1 Description of components 4 2 List of components 5 4 Shipping weight and dimensions of packed, set 6 4 II. Installation and assembly of Battery Tester TS-183/U. Unpacking, uncrating, and checking 7 4 Installation 8 6 Removal from service 9 6 PART TWO. OPERATING INSTRUCTIONS. Section III. Preoperational procedures. Preparation for use 10 7 Visual inspections 11 7 IV. Operation. Step-by-step operation of Battery Tester TS-183/U- 12 7 Use of the NO LOAD-TEST LOAD switch 13 7 PART THREE. MAINTENANCE INSTRUCTIONS. Section V. Preventive maintenance techniques. Meaning of preventive maintenance 14 9 Description of preventive maintenance techniques. _ 15 9 Common materials needed 16 10 Voltmeter 17 11 Load resistor and multiplier resistor cases 18 11 Jacks 19 11 Plug and test prods 20 13 Preventive maintenance check list 21 13 VI. Lubrication. 14 VII. Moisture proofing and fungiproofing. 14 PART FOUR. AUXILIARY EQUIPMENT. (Not used.)