Smith Systems offers zero, proximity and standard digital speed sensors. All three are active sensors. The standard sensors operate at 5 to 30 kHz, the zero speed in 0 to 20 kHz, and the proximity sensors from 0 to 2 kHz. They also carry passive speed sensors to convert mechanical motion to A/C voltage without a power supply.

Motion Sensors Inc offers hall effect, variable reluctance, RF eddy current, amplified active, and magneto-resistive speed sensors. Their VR models include the premium series which are hermetically sealed with a heli-arc welded construction, two pin gold plated glass sealed connectors, with a temperature range from -450 to +450F.

Automatic Controls offers AI-TEK speed sensors. General purpose passive speed sensors include designs such as passive, high sensitivity, full threaded, conduit fitting, intrinsically safe and high temperature designs. Hall effect, active speed sensors feature hex body with cable, explosion proof design, round body with connector, fully thread with leads, and zero velocity configurations. Bi-directional hall effect speed sensors feature stainless steel Hex body and round body.