Optolevel® AH Switch HomeProductsMiscellaneousOptolevel® AH Switch Optolevel® AH switch is an Alfons Haar Switch Knob Control. Optolevel Oy Front Page About us References Contact Products All products Level Control GateWay v10 2-Wire Optic Sensor 5-Wire Optic Sensor Mounting Pipe – – Identification Product Identification Device PRID Tag PRID OFP Tag – – Miscellaneous CAN-USB adapter Thermistor tester iLED OL Muff AH Switch Intra GW 10.6 Orderform GW 10.6 Transfer GateWay Configuration Software Downloads Warranty