Calibration Frequency for Surftest SJ-400

#1
Hi, I now working for an organization which has a portable surface tester. We use a precision reference standard to calibrate daily and have been using this standard for 15 years.... Question #1: Should I contact an organization to have the standard calibrated or just buy another one?

Question #2: We are using the surftester to get Rz and Ra on a cross hatch powdered metal surface, should we also have a cross hatch precision standard?

Thanks in advance for the suggestions.
 
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