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 Motor Controller — Standard

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

💨Stepless 0-100% speed control

🔋Rated 40A, max 60A current capacity

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Description

⚙️ Take control of your motor’s every move — because precision is power.

THERMAL ARMOR - Robust aluminum casing with strategic ventilation ensures your controller stays cool under pressure.
REAL TIME FEEDBACK - Bright LED display keeps you instantly informed of exact motor speed—no guesswork, just performance.
DIRECTIONAL COMMAND - Effortlessly switch between forward, brake, and reverse modes for ultimate motor maneuverability.
VERSATILE POWERHOUSE - Compatible with DC brush motors and light dimming circuits, perfect for professional-grade automation setups.
PRECISION SPEED MASTERY - Smooth, stepless potentiometer lets you dial motor speed from zero to full throttle with absolute control.

This PWM DC Motor Speed Controller operates on a broad DC voltage range of 10-55V, supports a rated current of 40A (max 60A), and offers stepless speed adjustment from 0% to 100%. Featuring a durable aluminum enclosure with heat dissipation vents, an LED display for real-time speed monitoring, and a forward-brake-reverse switch, it’s engineered for precise, reliable control of DC brush motors in industrial and automation applications.

Specifications

ASIN	B089273KVZ
Best Sellers Rank	#50,567 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Electrical Motor Controls
Brand Name	HARMNEE
Color	Silver
Customer Reviews	4.2 4.2 out of 5 stars (460)
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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MX$1048

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Mexico.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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