Normal 0 21 false false false HR X-NONE X-NONE MicrosoftInternetExplorer4 Hello, I'm using Multimode IIIa AFM. I'm trying to do some force measurements with polymers layers. Cantilever I usually use have spring constant around 100 pN/nm. The maximum contact force I can achieve with these probes are around 4 nN (deflection around 40 nm), and