Includes everything needed for immediate field use as a pH meter; Water Quality Meter 850081 (which already has a built in BNC connector), pH Probe 840016 (an epoxy body sealed reference combination electrode with a BNC connector, and a 2½" cable), ATC Temperature Probe 850082, instructions, pH buffers 4, 7, & 10, deionized water, calibration tool, and a 9V battery. All of these are contained in the meters own slim but protective hard-shell foam-lined case.