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I tēnā, hei tāwhai hoki ngā viscometer ā-pāpātanga. I te nuinga o te wā, me whakamātautau ngā kairangahau me ngā kaimahi i ngā taupua o ngā wāhi rerekē, nō reira he mea tino whai hua te viscometer e māma ana i te pākaro me te whakamārama i te whakamāmā o te whakamātau. Ko te tāwhai o ngā rākau ā-ringa nei i te whakamātautau i te pūkenga o te whakamātautau i te wāhi tonu, ā, he pai rawa ngā rākau nei mō ngā mahi i waho. I tēnā, kāore he rerekē te whakamātautau o ngā tau hou ake o ngā viscometer, ā, kua hanga kia kaha ake, kia taea ai te tū i ngā āhuatanga tino pākaha. Nō reira, ka whakamāhinga ngā rākau nei i ngā āhuatanga rerekē, kāore hoki he pākaha o te whakamāhinga. Ko te whakawhitinga o ngā rākau mātauranga me te ā-pāpātanga o ēnei rākau i whakamāhinga ai ngā viscometer hei rākau tino whai hua mō ngā rōpū rerekē o ngā umanga, ā, mō ngā whakamātautau hoki: mai i te whakamāhunga kai, i te wāhi o ngā hinu me ngā hua o te pētirōli.