100 Ohms 0.125w 0.02% reference resistor (Mann MX250) can be used for callibration of test meters etc. military grade component S.I. No. 40-528-335-01 from aviation supplier unfortunately no info available on manufacturer. Status: NOS ( New Old Stock) RoHS compliant : Na tested 14/2/14 : 100.00 Ohms digital meter only goes to two decimal places !