Go Direct* Photogate, double-gate sensor that includes two photogates built into the arms of the sensor, which accurately measures velocity and acceleration, Infrared source: Peak at 880 nm, Gate width: 77.5 mm, Battery: 300 mAh Li-Poly Rechargeable
Go Direct* Sound Sensor is used to easily capture and evaluate waveforms, connects via Bluetooth* wireless technology or wired via USB, for College, High School, and K–8, Rechargeable Battery, Response: A- or C-weighted, Range: 55–110 dB, Resolution: 0.1 dB
Go Direct* Tris-Compatible Flat pH User Manual, used for any lab or demonstration that can be done with a traditional pH meter, including acid-base titrations, monitoring pH in an aquarium, and investigating the water quality of streams and lakes