Price Minimum 500 ml-bottle original Testomat Indicator TC 2100 for limit value 1,00-20,00 dH for measuring residual hardness in water. dH (resolution): 1,00-20,00 (1,00) f (resolution): 1,79-35,8 (1,79) ppm CaCO3 (resolution):18-358 (18) mmol/l (resolution ...