Can somebody recommend the best (vendors) strains and stresses gauges (instruments) to me?

As a stress analyst, it is good for one to have these instruments to maximize services to clients. I mean, sometime it is good to look beyond our PC by going to the field to determine the strains and stress as it affect our process plants or structures or otherwise. The only way we can integrate this into our problem solving is doing the measurement using the appropriate strains and stresses gauges.

I need (vendors) strains and stresses gauges for static, dynamics and plastic effect.