Txoj keeb ntsej, uas fej muaj tshaj plaws hauv cheeb tsam tias yog txoj keeb lossis txoj keeb ntsej, yog qhov chaw tseem ceeb uas tsim nyog rau keeb cov khoom sib thooj thiab sib txig nrog rau ib qhov keeb, rooj keeb, lossis rooj. Qhov tswj yim tshaj plaws ntawm nws yog mus rau kev pab pawg cov khoom los ntawm kev tsim kho lossis kev kuaj xyuas mus rau hauv cov keeb compact, kev xaiv, thiab kev saub xov toom rau kev ceev faib, tuav, thiab kev tshuaj xyuas tom qab. Cov khoom tseem ceeb ntawm txoj keeb ntsej muaj qhov tso tawm, qhov kev saib xyuas kev puas siab, ib qhov rooj pov ntxoov uas tso rooj keeb, thiab ib qhov rooj saib xyuas kom muaj zog rau kev xaiv cov khoom zoo li ntawm sab nraud ntawm rooj keeb. Qhov kev tshuaj xyuas hauv kev keeb yog nyob ntawm kev saib xyuas kev puas siab thiab kev xaiv. Kev puas siab tuaj yeem saib xyuas los ntawm ntau qhov kev tshuaj, los ntawm kev siv phau ntawv me me mus rau kev siv kev tshuaj xyuas servo uas saib xyuas lub zog zoo ib yam, uas yog qhov tseem ceeb rau kev tiv thaiv kev sib txig thiab kev sib puas ntawm cov duab me me. Qhov kev saib xyuas kev keeb tau txiav txim siab tias cov khoom yuav keeb nrog qhov kev xaiv zoo ib yam, piv txwv li kev keeb nrog kev tiv thaiv lossis kev keeb nrog kev tiv thaiv. Txoj keeb ntsej muaj ntau yam kev sib txawv thiab muaj kev xaiv nrog kev keeb nrog sab nraud lossis sab saud, nrog ib lossis ntau qhov rooj pov ntxoov, kom raug rau kev tsim kho thiab yam khoom sib txawv. Hauv cheeb tsam kev tsim kho dej nkag, ib qhov keeb ntsej meej meej yog qhov tseem ceeb rau kev tshuaj xyuas cov khoom zoo li polymer seals, tubing, thiab cov duab sib txig. Los ntawm kev tsim kho ib qhov keeb kheej kheej, nws tiv thaiv daim duab ntawm cov khoom los ntawm kev puas tsuaj, tiv thaiv kev sib tshooj, thiab pab tau rau kev tshuaj xyuas nrog kev tshuaj xyuas hauv cheeb tsam ntawm tus neeg siv khoom, ua rau nws yog ib qhov tseem ceeb hauv kev tsim kho rau txhua tus neeg uas tsim kho cov khoom ntev thiab sib txig.