Vintage,old Elion,military issued,serial #30, TV2 c/u tube tester. Great condition. I tested a 5y3, and it seemed to work as it should. Only instructions I have is what is on the inside cover. All switches and dials work. Im sure it needs to be calibrated. There were no screws for the unit to secure to base,so I used what I had. Also repaired grid cap wires that were dried/cracked. There are 2) 83 tubes that test good, and three 6volt miniatures(dont remember type,and couldnt test them). Please check my other sales for vintage test equipment and audio equipment.