Nowadays precision dew point hygrometers are mostly the type of light-electricity detection,thermoelectric refrigeration and specula-surface condensation dew point instrument internationally.
After many year development, industrial structure's adjustment, the region ground industry begins to take shape, the kleit precision work prospect favors.
High precision instruments of measuring electrical resistivity and magnetoresistivity are needed to study the inner structure and resistance characteristic of nanocrystalline materials.