IVEK Maintainer Metering System Controller Rotary Liquid Model#- Maint-165-B This is extremely hard to find Maintainer from IVEK. This does very specialized work and would normally cost a TON. But not with me. You can get this for cheap with me. From Manufacturer: Overview: The Maintainer Controller Module is a component in a rotary liquid metering system consisting of a Controller, Motor/Base and Pump Module(s) providing automatic continuous set-point control of process variables in chemical or biological systems. The controller is easily programmed by the user and can be interfaced directly with a process instrument such as a pH meter, or other analog output process signal in order to provide set-point control. It is designed to provide a metering rate proportional to the process deviation from a set-point, virtually eliminating overshoot and generally enhancing process stability. Features: Digital control of Stepper Motor Minimal maintenance System Response Factor (SRF) multiplier switch Auto/Manual switch Direct/Inverse switch Slope Multiplier to select RPM range NEMA 4X enclosure available Set-point control of process variables Accepts analog control signal: 4-20mA CE Certificate available This controller used with the following modules: Microspense AP Motor/Base Module Heavy Duty Motor/Base Module Split Case Pump Module Micro Rotary Pump Module Disclaimer - Seller not responsible for any damage to life, limb, or property due to this device. Buyer must test this device to ensure it functions properly before its use. If unit is found malfunctioning this seller will offer money back. Will ship free..... please ask questions. Will ship international.... we get good rates. Contact us for prices...