Manometer[india] pvt. Ltd. Offers documenting process calibrators, model-744, manufactured by fluke corporation, usa. The fluke 744 offers the ability to calibrate, maintain, and troubleshoot hart instrumentation with just one tool. It offers: • integrated hart communication functions, permitting you to monitor, control, and calibrate hart instrumentation. • handling of fast pulsed rtd transmitters and plcs, with pulses as short as 1 ms. • nimh battery with 3500 ma hour life and gas gauge. The 744 offers the most complete hart implementation of any process calibrator.