Thermometer ndi chipangizo chopangidwa kuti chiyese kutentha . Pali mitundu yambiri ya ma thermometer, koma onse amagwira ntchito mofanana. Nthawi zambiri, timagwiritsa ntchito zipangizo zoyezera kutentha, zomwe zimasintha ndi kutentha. Ngati kutentha kwa chinthu kumasintha, mawonekedwe ake ndi kukula kwake zimasinthanso. Ma thermometer ambiri amagwiritsa ntchito zipangizo zomwe zimakula kapena kufupika ndi kusintha kwa kutentha.
Thermometer chomwe chimagwiritsidwa ntchito nthawi zambiri masiku ano chimakhala ndi chubu chagalasi, momwe muli mowa kapena 
mercury pakati pa chubu. Pamene kutentha Pamene kutentha kukukwera, mowa kapena mercury yomwe ili mu chidebecho imakula, zomwe zimawonjezera kutalika kwa kolamu ya mowa kapena mercury. Mosiyana ndi zimenezi, pamene kutentha kukuchepa, kutalika kwa kolamu ya mowa kapena mercury kumachepa. Kunja kwa chubu chagalasi kuli manambala omwe akuyimira sikelo ya thermometer. Nambala yomwe imasonyezedwa pamwamba pa kolamu ya mowa kapena mercury imasonyeza kutentha kwa chinthu chomwe chikuyesedwa.
Mtundu wina wa thermometer womwe umagwiritsidwa ntchito kwambiri ndi womwe umagwiritsa ntchito bimetallic strip (zitsulo ziwiri zosiyana zomwe zimakhala ndi kuchuluka kosiyana kwa kukula). Pamene kutentha kukukwera, chitsulo chimodzi chimakula kwambiri kuposa china, zomwe zimapangitsa kuti mzerewo upinde. Kawirikawiri, bimetallic strip imakhala yozungulira, yokhala ndi mbali imodzi yokhazikika ndipo inayo yolumikizidwa ku sikelo. Pamene kutentha kukusintha, pointer imazungulira. Ma thermometer omwe amagwiritsa ntchito bimetallic strip nthawi zambiri amagwiritsidwa ntchito ngati ma thermometer wamba a mpweya, ma thermometer a chipinda, ma thermometer a uvuni, ndi zina zotero.
Ma thermometer olondola kwambiri, kapena olondola kwambiri, nthawi zambiri amagwiritsa ntchito mphamvu zamagetsi za chinthu. Mwachitsanzo, thermometer yokana imayesa kusintha kwa kukana kwamagetsi kwa waya woonda kapena silinda ya kaboni kapena germanium crystal. Chifukwa kukana kwamagetsi nthawi zambiri kumatha kuyezedwa molondola, ma thermometer okana amatha kuyeza kutentha molondola kwambiri kuposa ma thermometer wamba.
