settlement platform monitoring

We have a proposal for services to monitor settlement platforms for an interior excavation and underpinning of a foundation. The elevations need to be measured to 0.005'. I havent done this for many many years, and I was told that all the micrometers in use now are in metric (and, of course there are none available for the levels we have)

Cost estimates range from $4105 for a NA2 Leica level, micrometer and rod, and $6000 for a digital DNA03 - Leica w/rod $6305.00 (converts to ft).

Have any of you done settlement platform monitoring lately, and what techniques/equipment did you use to achieve this desired accuracy?

Thanks