This is a combined synopsis/solicitation for a sole-source procurement intended for Research Electronics International LLC. The requirement is to procure six handheld Radio Frequency Spectrum Analyzers and five MESA upgrades for delivery within 140 days after the date of award. The government intends to award a firm-fixed-price purchase order. While this is a notice of intent for a sole-source action, the government will consider quotations received from other interested parties.