PHC-402 Dual Relay Digital pH Controller with Temperature Compensation UP and DOWN Adjustable Dosing for Aquarium, Hydroponics System and Indoor Plant Grow

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This pH Controller is specifically engineered to deliver precise and dependable pH measurement and control for a wide range of aqueous solutions, such as hydroponic nutrient mixes and fish aquariums. It accomplishes this by first assessing the pH level of the target water and subsequently automatically introducing pH-adjusting substances, either acidic or alkaline, to achieve the user's desired pH level.

Say goodbye to pH fluctuations and hello to stability and peace of mind. Purchase yours today and experience the difference in pH management!


  • Accurate pH Measurement
  • LCD display for comprehensive Data Display
  • Includes chart display that records pH and temperature readings for up to three days
  • Dual relay output allows you to switch between UP and DOWN modes
  • High-precision pH Sensor with temperature compensation
  • Easy Plug and play operation
  • Auto record Max/Min/Avg data after powering on
  • Switchable temperature unit


Typical test conditions, unless otherwise specified: Ambient Temp =23+/-3°C, RH=50%-70%, Altitude=0~100 meter

  • pH Control Range: Adjustable 4.5~8.5pH
  • pH Resolution: 0.1
  • pH Accuracy: ±0.2pH
  • Temperature Accuracy: ±1°C, 1°F
  • Input Power: 100~240VAC, 50/60Hz
  • Maximum Amperage: Max. 10A, 100~240VAC
  • Input Power Cable Length: 150cm/5ft
  • Output Power Cable Length: 100cm/3.2ft
  • Dimension: 195 x 120 x 43mm (7.7 x 4.7 x 1.7inch)

Set Includes: 

  • 1 x pH Controller (main unit with socket)
  • 1 x pH Sensor Probe
  • 1 x Peristaltic Dosing Pump
  • 1 x L-bracket
  • 1 x Silicone Tubing
  • 1 x Fastening Nut
  • 2 x Screws and Expansion screws
  • English Instruction Manual
  • Standard Factory Packaging

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