The Wireless Colorimeter & Turbidity Sensor Pack contains 8 Wireless Colorimeter & Turbidity Sensors inside a Gratnells storage tray. Also inside the tray is a custom insert designed to securely fit each sensor and its accessories (cuvettes, cuvette holder, and 100-NTU calibration solution). These trays provide a convenient and well-ordered storage solution for any classroom, while also making transportation between classrooms effortless. The custom storage insert has extra spaces to hold up to 10 Wireless Colorimeter & Turbidity Sensors.
https://www.pasco.com/products/sensors/wireless/ps-3334#specs-panel