Radstar RS-300 Radon Monitors

Retiring the testing division of my company and I have 7 Radstar RS-300’s for sale. All in perfect working order. Each one includes key, power adapter, comm cable, and tripod. Typical wear and tear. All need calibration, so priced accordingly. Prefer selling entire lot, but will consider splitting them up. $350 each plus shipping. Thanks.
Radontex, LLC.