Phidget Encoder HighSpeed

The PhidgetEncoder HighSpeed connects to any typical two-bit optical encoder and can return up to 2,000,000 pulses (that is, 500,000 full quadrature cycles) per second.
Specifically it reads a standard incremental non-differential TTL encoder.
The 1057 can be used to measure shaft speed or as a very accurate human input device. If you just need a simple human input device have a look at the 1052- PhidgetEncoder.
With it you can:
Detect changes in incremental position
Easily track changes with respect to time
Product Specifications
Board
API Object Name - Encoder
Number of Encoder Inputs - 1
Count Rate Max - 2E+06 pulses/s
Encoder Interface Resolution - x4
Update Rate - 125 samples/s
Time Resolution - 1 ms
Encoder Input Low Voltage Max - 800 mV DC
Encoder Input High Voltage Min - 3.6 V DC
Encoder Pull-up Resistance - 2.2 k?
USB Speed - Low Speed
Electrical Properties
Current Consumption Max - 100 mA
Current Consumption Min - 20 mA
USB Voltage Min - 4.8 V DC
USB Voltage Max - 5.3 V DC
Physical Properties
Operating Temperature Min - 0 °C
Operating Temperature Max - 70 °C