United Scientific Supplies AUDCND Electronic Conductivity Tester with Audio Signal Science Lab Indicator for Strong and Weak Electrolytes

Investigate the conductivity of a solution with this excellent alternative to light only indicators. The current flow to a buzzer changes with the conductivity of a solution. The more free ions in a solution, the better it conducts electricity and the louder the buzzer sounds. Includes an on/off button with an LED to indicate if the unit is turned on. Includes activity guide. Requires a 9V battery (not included).

Features:

• Buzzer provides an audible indicatorof the conductivity of a solution
• Reusable design
• Includes activity guide