Page 33 of NMR Sampling Tubes, Supplies & Accessories by Wilmad Labglass

external reference system wilmad s external reference coaxial system is perfect for isolating your reference solution from sample each insert fits with precision into the outer tube the flat bottom forces the reference solution upwards between the inner and outer tubes simple to use just place your sample in the insert and add a few drops of reference solution to the bottom of the outer tube when pushing the inner tube downward the reference solution is forced upwards and forms a thin film about 50 µl thick between the tubes you can choose between 3 5 and 10mm sizes complete set product no 516-cc-3 516-cc-5 516-cc-10 insert product no 516-i-3 516-i-5 516-i-10 outer tube product no 516-o-3 516-o-5 516-o-10 id mm 1.07 2.97 7.87 id mm 1.93 4.07 8.99 od mm 3 5 10 od mm 1.83 3.97 8.89 od mm 3 5 10 each insert fits snugly into the outer tube much like a syringe plunger fits its barrel the flat bottom helps force reference liquid upward between the inner and outer tubes inserts 1-800-220-5171 27

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