Take a sample of groundnut of 100gm approximately. and take the weight of the sample with container. Put the container with groundnut sample in oven at 50-60 oC for 16-24 hours till weight decrease stopped. Take a weight of container with groundnut and find the MC as below.
MC(%) on dry weight basin=100 * (weight of groundnut sample with container before drying -weight of groundnut sample with container afterdrying)/ (weight of groundnut sample with container afterdrying- weight of container).
OR
MC(%) on wet weight basin=100 * (weight of groundnut sample with container before drying -weight of groundnut sample with container after drying)/ (weight of groundnut sample with container before drying- weight of container).
Use bone dry oven method to estimate m.c. of groundnut pod by putting sample at 105 degree celcius temperature for 24 hours.
You can directly measure the commercially available moisture meter for dry matters.
Take a known weight of groundnut pod (initial weght) = x and put inside a container with a known weight and oven dry at 75oc to a constant weight. Weigh the oven dried groundnut pod = y and subtract it from the initial weight of the groundnut pod before oven drying = x and divide by initial weight of the groundnut pod before oven drying = x and multiply by 100.
That is: o/o MC = (x-y)/x * 100
