Bevosita baxolash usuli - bevosita ulchash asbobining sanash kurilmasi yordamida tugridan-tugri ulchanayotgan kattalikning kiymatini topish. Masalan, Prujinali manometr bilan bosimni ulchash yoki ampermetr yordamida tok kuchini topish.
O`lchov bilan takkoslash (solishtirish) usuli - ulchanayotgan kattalikni ulchov orkali yaratilgan kattalik bilan takkoslash (solishtirish) usuli. Masalan, tarozi toshi yordamida massani aniklash. ulchov bilan takkoslash usulining uzini bir nechta turlari mavjud:
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