Precision Model 220 Marker Adder Manual $8.99 Category: Precision Apparatus Company Description Description For sale is reprint of Precision Model 220 Marker Adder Manual. Manual is 10 pages long, Dated 1956. Sections include: Introduction, Circuit Description, Operation, Service Notes, Etc. Manual includes schematic. Related products Precision Supplementary Tube Test Data for 10-40 Tube Testers $9.99 Read more Precision Tube Tester Model 660 Operating Instructions with Tube Data $11.99 Read more Precision Tube Test Data for 10-12 10-15 10-20 10-22 10-54 Tube Testers $9.99 Read more Precision Tube Tester 10-54 Operating Instructions $8.99 Read more