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 Apparatus EV-10A Vacuum Tube Multi-Meter Manual $8.99 Read more Precision Tube Test Data for 612 614 620 654 Tube Testers $10.99 Read more Precision Apparatus EV-20 Vacuum Tube Multi-Meter Manual Read more Precision Tube Tester 612 and 614 Operating Instructions $7.99 Read more