This Symmetricom SA.22c rubidium frequency standard module is a valuable asset to any business or individual in need of precise frequency measurements. It has been properly maintained and thoroughly tested to ensure proper functionality. Its brand, Standard, is a trusted name in the industry. The module falls under the categories of Business Industrial, Electrical Equipment Supplies, Electronic Components Semiconductors, Passive Components, Crystals Oscillators. It is a used item but has been well taken care of. Trust in the accuracy and reliability of this rubidium frequency standard module for all your frequency measurement needs.