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Ø Calibrated tachometer - for centrifuge Ø Calibrated digital temperature sensor - for checking temperature of refrigerator, incubator etc. Ø Calibrated glass thermometer- for temperature checking of oven, water bath etc. Ø Calibrated weights - for balance Ø National Institute of Science and Technology (NIST) buffer - for pH meter. Standard buffer solutions bought from reputed manufacturers with certifiable traceability can be used as alternative.