Opening A Form To A Specific Record

I have a Calibration form, with a button on it that links to an Equipment Inventory form. In the Calibration form, you choose
the instrument you want to calibrate from a combo box (which in turn automatically selects the barcode number for the instrument in another combo box), then if you need to edit info on it (ie. serial number), you click the button

Now, I need the Equipment Inventory form to open to the record that matches the bar code in the second combo box

anyone know a simple way of doing this?