can this pulse 12v , would it be ble to pulse 12v injector for cleaning ?

The voltage of your injector is between our controller voltage range (10~55V). If your injector is with a DC brush motor and the rated current is below the 60A, HARMNEE pwm motor speed controller will fit for your injector. The rated current is equal to the rate of power divided by voltage 12V.

Why is there a 3 way switch for this?

one is for turning off the motor and the other two are for forward and reverse.

Can it be used with arduino to control motor speed and direction?

I can't imagine why not as long as the Arduino project meets the volt and amp capacities of the Controller.

Lemon? Two right most terminals wired to 20V battery but the voltage across the two left most terminals always 20V no matter the % of pot adjustment.

unplug the pot and connect a meter to center leg and either side legs and check ohms clime as you turn the knob. Make sure all connections are correct. If pot works then controller is bad.

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PWM DC Motor Speed Controller, DC 10-55V / Rated 40A / Max 60A LED Display Stepless DC Motor Controller with Adjustable Potentiometer & LED Display Screen & Forward-Brake-Reverse Switch

PWM DC Motor Speed Controller, DC 10-55V / Rated 40A / Max 60A LED Display Stepless DC Motor Controller with Adjustable Potentiometer & LED Display Screen & Forward-Brake-Reverse Switch

Product ID: 206202711

Details

Brand
HARMNEE
Color
Silver
Item Weight
240 g
Material
Metal
Product Dimensions
3.1"L x 4.5"W

⚡DC 10-55V wide voltage range

📊LED display shows 0-100% speed

🔋Rated 40A, max 60A current capacity

KD 10.20

Duties & taxes included

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Description

⚙️ Master your motor’s pace with precision and power!

REAL TIME FEEDBACK - Clear LED display keeps you informed of exact motor speed at a glance
DIY READY VERSATILE - Perfect for DC brush motors in various projects—engineered for makers who demand reliability
ROBUST HEAT MANAGEMENT - Durable aluminum enclosure with ventilation holes for superior heat dissipation
DIRECTIONAL FLEXIBILITY - Easy forward, brake, and reverse switch for full rotation control
PRECISION SPEED CONTROL - Stepless potentiometer knob for smooth 0-100% motor speed adjustment

The HARMNEE PWM DC Motor Speed Controller offers professional-grade control for DC brush motors with a wide input voltage range of 10-55V and a robust rated current of 40A (max 60A). Featuring a stepless potentiometer for smooth speed adjustment, a forward-brake-reverse switch for directional control, and an LED display for real-time speed monitoring, it’s housed in a ventilated aluminum case ensuring excellent heat dissipation. Ideal for DIY enthusiasts and professionals seeking reliable, precise motor speed regulation.

Specifications

Asin	B089273KVZ
Best Sellers Rank	#49,037 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #8 in Electrical Motor Controls
Brand Name	HARMNEE
Color	Silver
Customer Reviews	4.1 4.1 out of 5 stars (468) 4.1 out of 5 stars
Display Type	LED
Item Dimensions L X W X H	3.1"L x 4.5"W x 1.4"H
Item Weight	240 g
Manufacturer	WellHome Innovation
Material Type	Metal
Model	Standard 10-55V/60A Max
Number Of Items	1
Part Number	Standard 10-55V/60A Max
Unit Count	1 Count

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