The Delmhorst MCS-COTTON cotton moisture content standard is great for verifying that your C-2000 cotton moisture meter is in calibration. Note that the 30-E/C long pin electrode is required to use the MCS-COTTON. With two electrical resistance values (6% and 12%) to test your meter against, you can be sure that your readings will stand up to the strictest standards of accuracy. The MCSCOTTON is also available with a letter of certification traceable to NIST.