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 Tube Tester 612 and 614 Manual with Tube Test Data $14.99 Read more Precision Tube Tester 10-40 Manual with Tube Test Supplement Data $8.99 Read more Precision Supplementary Tube Test Data for 10-40 Tube Testers $9.99 Read more Precision Tube Tester 620 Operating Manual $8.99 Read more