An operating manual for your particular GOW-MAC instrument may be purchased from GOW-MAC by calling our sales department at (610) 954-9000 (USA), +886-3-5422845 (Taiwan), or +86-13-501010846 (China). When calling, please have ready the instrument's complete model number and serial number. Both are found on the silver serial number tag located on the back of the instrument. Manuals are hard copy only. Shipping is via UPS Ground unless otherwise stated at time of order.