FLW is the largest stocking distributor of AI-Tek Instruments (formerly Airpax Instruments) providing a complete line of tachometers, speed indicators, variable reluctance speed sensors, magneto-resistive and hall effect sensors to measure rotary speed. Your sensor, when you need it. Additionally, as an authorized AI-Tek distributor for over 20 years, we have the expert technical support to answer your difficult application questions. Also, be sure to contact us for your volume, OEM, or reseller discounts. AI-Tek Instruments makes hundreds of types of speed sensors. Three technologies are used: variable reluctance, magneto-resistive and hall effect to convert motion into an electronic signal. In addition to the full range of speed sensors, FLW offers electronic indicators and controllers as well as a full range of other accessories.