For sale is reprint of EICO 239 Solid State FET TVM VoltMeter Manual. Manual is 16 Pages long and includes 11×17″ foldout of circuit diagram, Dated 1971.
Sections include: General Descriptions, Circuit Description, Operating Control and Indications, Calibration, Battery Replacement procedure and Maintenance. Manual includes diagram and part list. Most of 239 meters were sold as kits, I have construction manual for this meter in my store.