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TEM01071B G1/4" Water Flow Sensor
US$15.33
This consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rate of flow.
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RKA-7DZ-12 Relay, 12VDC, 5A, DPST-NO
US$13.99
Type: Miniature PCB Relay. DC Coil Voltage: 12 V. Maximum AC Voltage Rating: 240 V. Relay Construction: Non-Latching. Contact Material: Silver Nickel. Maximum DC Voltage Rating: 24 V.
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2424-ADA Automotive Gauge Stepper Motor - x27.168
US$13.93
They have extremely fine step precision of about 1/2 a degree per step for single stepping, fast response for quick movements, and a range of  ~315° degrees.
Delivery within 2-3 weeks
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ROB-12779 EasyDriver - Stepper Motor Driver A3967
US$20.93
The EasyDriver is a simple to use stepper motor driver, compatible with anything that can output a digital 0 to 5V pulse (or 0 to 3.3V pulse if you solder SJ2 closed on the EasyDriver). It requires a 6V to 30V supply to power the motor and can power any voltage of stepper motor.
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PBS-190 Momentary Tactile Pushbutton Switch
US$0.69
This breadboard friendly Tactile Momentary Pushbutton Switch is excellent for your electronic projects.
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DFR0332 Fan Module
US$6.25
Make an air aerial propeller vessel, a cooling system, or spinning machine with this small fan module. It comes with a propeller, a 15,000 rpm motor and cable. Add flavor to your own interesting projects with this module.
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COM-13247 Magnetic Door Switch Set
US$5.53
Dimensions: 34 × 41 × 6.5 mm. Includes: 1x Magnetic Door Switch Set. 4x Phillips Mounting Screw. Features: Max Voltage: ≤100VDC. Max Current: ≤500mA. Max Rating: ≤10W. Gap: 20±5mm. Contact Mode: NO/NC.
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2676-POLOLU 25D mm Metal Gearmotor Bracket Pair
US$10.43
These aluminum gearmotor brackets let you securely mount Pololu’s 25D mm metal gearmotors to your project. 
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COM-13253 Rotary Switch - 10 Position, single pole
US$3.47
This is a single pole, 10 position rotary switch able to select up to 10 different states in a durable package. Unlike our other rotary switch, this model is much more robust and capable of handling larger currents and voltages.
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2275-POLOLU 75:1 130RPM Metal Gearmotor 25Dx54L mm HP with 48 CPR Encoder
US$51.73
This cylindrical, 2.62" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 74.83:1 metal gearbox to deliver a lot of power in a relatively small package.
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SSW-130-L DPDT ON-ON Large Solder Slide Switch
US$1.33
MTG Screw Holes L = 1" (25mm). MTG Screw Holes Dia = .01" (2.5mm). Body L = 0.875" (22.2mm). Body W = 0.50" (12.7mm). Top Bezel L = 1.375" (35mm). Top Bezel W = 0.50" (12.7mm). Overall Depth = 0.5" (12.7mm).
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2285-POLOLU 47:1 120RPM Metal Gearmotor 25Dx52L mm with 48 CPR Encoder
US$48.93
This cylindrical, 2.54" x 0.98" x 0.98" brushed DC gearmotor with a 46.85:1 metal gearbox is a lower-current alternative to the HP version. It has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 2249 counts per revolution of the gearbox’s output shaft.
Delivery within 2-3 weeks
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DS-13 SPDT ON-ON Mini Slide Switch
US$0.69
ON-ON. SPDT. 3 pin R/A. 6A@120VAC/28VDC.
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1935-ADA Wired Miniature Electret Microphone
US$1.90
That's one tiny microphone! At about the size of a mature aphid, this wired Electret Microphone is perfect for your FONA. Diameter: 4.4mm. Wire Length: 67mm. Weight: .17g.
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FH503 Fuse Holder
US$1.74
This fuse holder is designed to accept 5x20mm fuses. Use with ABRA GMA and GMD series fuses. Screw mountable with .166” center opening. Connections via 0.187 faston tabs or soldering. Dimensions: 1.5” L x 0.35”W x 0.725” H. 
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169 - 183
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185 - 199