a pH meter is an under-utilized tool on many dairy operations, says Randy Asher, a dairy nutrition consultant based in Brookings, S.D. A pH meter is commonly used to check the urine pH of dry cows fed anionic salts. However, you also can use it to check the pH of manure, teat dip or even silage. The pH of silage is a good indicator of fermentation quality. Cost of pH meters varies from $45 to $500.