No need to mess around trying to mount meter sticks when you do your resonance experiments. The glass resonance tube in this superior apparatus is calibrated right on the glass! This direct calibration provides more consistent student data and more accurate readings. The tube is mounted on its own support stand and connected with surgical tubing to its aluminum water reservoir. The reservoir is easily moved up and down with the knurled adjustment screw built into the support clamp. Includes a tuning fork with a frequency of 512 Hz. Comes complete with experiment directions.