Rockwin supplies the contoil range of pd meters. The principle on which this oil flowmeter work, is the ring piston principle. These pd meters are idealfor lshs, ldo, hsd, petrol, atf, and lubricating oils. Following are some of the technical features of this oil flowmeter which include: miniature series is available in 4 mm and 8 mm sizes with flow capacities from 1 to 135 lph; standard series consists of 15 to 50 mm models with flow capacities from 10 to 30,000 lph. A mechanical register is provided to all the models. Optional pulse transmitters are used for interfacing with secondary instrumentation for remote indication of total flow, flow rate, batching, flow alarms, etc, are also available.