KIBU2023-05-082023-05-082022-11-24http://erepository.kibu.ac.ke/handle/123456789/9382SPC 421:Measurement and instrumentationenAttribution-NonCommercial-ShareAlike 3.0 United Stateshttp://creativecommons.org/licenses/by-nc-sa/3.0/us/SPC 421:Measurement and instrumentationMeasurement and instrumentationSPC 421Other