<< ASI Instruments >> About ASI Instruments ASI Instruments, Inc. specializes in manufacturing a broad range of high reliability level instruments for dry bulk solids measurement. Founded in 1978, ASI has a reputation for taking on the toughest level applications, including coal, rock crushing, and carbon black. ASI manufactures a complete line of rotary paddle switches, vibrating fork switches, plumb bobs, RF capacitance switches & transmitters, ultrasonic transmitters, laser transmitters, and guided wave radar devices. Used in over 50,000 installations throughout North America an