Tus nqi ntawm tus tawg-pov thawj hloov yog kwv yees li ntawm kwv yees li ntawm 20 USD, feem ntau siv rau cov ntaub ntawv uas tsim nyog muaj kev ruaj ntseg, kev ua siab, thiab yooj yim ntawm disassembly.
Cov switches no tseem ceeb rau hoobkas machinery thiab lub nruab uas flammable gases tej zaum yuav tam sim no. Lawv kuj lug siv nyob rau hauv cov tshuaj industries, tej yam zoo tshaj plaws, grain warehouses, pleev xim rau hauv cov nroj tsuag, txheej txheem, qhov zoo tshaj yuav ua tau, dockyards, kav dej phwj.