Ko te WP402B, he taputapu tuku pēhanga kiato, he tohu LCD tino tika kua whakamātauhia e te ahumahi, ka tīpako i te wāhanga pūoko tino tika. Ka hangaia te ātete mō te whakatikatika pāmahana ki runga i te papa uku whakaranu, ā, ka whakaratohia e te maramara pūoko he hapa pāmahana iti rawa o te 0.25% FS i roto i te awhe pāmahana whakatikatika (-20~85℃). He kaha te ārai-aukati o te hua, ā, he pai mō te tono tuku tawhiti. Ka whakauruhia e te WP402B te wāhanga pūoko mahi-teitei me te LCD iti ki roto i te Whare porotaka kiato.
Ka tīpakohia e te tuku pēhanga WP402A ngā wāhanga tairongo tino tika kua kawemaihia, me te kiriata ārai-waikura. Ka whakakotahihia e te wāhanga te hangarau whakauru āhua-totoka me te hangarau diaphragm wehe, ā, mā te hoahoa hua ka taea e ia te mahi i roto i ngā taiao uaua me te pupuri tonu i te mahi pai rawa atu. Ko te ātete o tēnei hua mō te whakatikatika pāmahana ka mahia ki runga i te papa uku whakaranu, ā, ka whakaratohia e ngā wāhanga tairongo he hapa pāmahana iti o te 0.25% FS (mōrahi) i roto i te awhe pāmahana whakatikatika (-20~85℃). He kaha te ārai-aukati o tēnei tuku pēhanga, ā, he pai mō te tono tuku tawhiti.