ph controllers, flow controllers, sight flow indicators, flow switches, liquid level gages, pressure gages, temperature gages, fluid or liquid leak detectors, liquid level indicators, ph indicators, ph instruments, pneumatic signal devices, pressure indicators or controllers, pressure instrumentation, displacement sensors, liquid level switches, pressure switches, electronic temperature controllers, flow transmitters, transmitters, liquid level available from national magnetic sensors inc based in plantsville, ct. click the links below to visit our website or contact us via our profile page.