Variants and Accessories for the Advent Combined Laser Optical/Contact Tachometer Kit including additional Remote Laser Sensor   Advent Combined Laser Optical/Contact Tachometer Kit Contact Adaptor - heavy duty 20cm wheel with ribbed surface Contact Adaptor - heavy duty 20cm wheel with smooth surface Yarn & Fine wire speed length - Fits A2103 & A2103/LSR models (Optional) MiniLaser mounting bracket