Nagman instruments and electronics pvt ltd manufactures low/medium temperature calibrator, model 350 h, 350 h2, 650 h and 650 h2. These are specially developed for quick / fast site calibration of rtd`s/ t/c`s, bi-metal thermometers, temperature Switches / indicators etc. These are provided with interchangeable thermowells. Some key features of these heavy duty low/medium temperature calibrators are as follows: