Ichi ndi makina owotcherera achuma komanso osavuta okhala ndi mapangidwe ophatikizika a makina onse. Ili ndi mawonekedwe owoneka bwino komanso opepuka, mawonekedwe ang'onoang'ono, otetezeka komanso osavuta. Amagwiritsidwa ntchito kwambiri m'madera ambiri
Ubwino:
1. Mkulu khalidwe kunja akupanga transducer, wamphamvu mphamvu, wabwino bata
2. Liwiro lowotcherera mwachangu, kuwongolera mphamvu kwamphamvu, kumatha kutha mkati mwa 10s ya kuwotcherera