Water Quality Sensor Combo Set: Four Sensors, One Complete Water Monitoring Kit

This combo set gives you the four most important sensors for water quality monitoring in one package: pH, TDS, Turbidity and DS18B20 Temperature. Connect them to an Arduino, ESP32 or NodeMCU to measure acidity, dissolved solids, clarity and temperature of water. It is a ready choice for EEE, CSE and Mechatronics students in Bangladesh building final year projects on drinking water, fish pond, aquaponics, river pollution and smart agriculture monitoring.

What’s Inside the Combo (label of each sensor)

Sensor 1: pH Sensor

• Measures acidity/alkalinity of water, range 0-14 pH
• [BNC pH probe + PH-4502C signal board, analog output]
• Onboard potentiometer for calibration
• Use: drinking water, fish tank, hydroponics, soil solution

Sensor 2: TDS Sensor

• Measures Total Dissolved Solids in ppm, range [0-1000 ppm]
• [Analog TDS module + waterproof probe]
• Use: drinking water purity, RO water check, aquarium

Sensor 3: Turbidity Sensor

• Measures how clear or cloudy the water is, by light transmission
• [Analog + digital output module with probe]
• Use: river and pond monitoring, washing machine, water filter check

Sensor 4: DS18B20 Temperature Sensor

• Waterproof stainless steel probe, range -55°C to +125°C
• Digital 1-Wire output, accuracy ±0.5°C
• Use: water temperature compensation, fish pond, boiler, aquarium

Key Features

• 4 important water parameters in one set
• Works with Arduino Uno, Nano, Mega, ESP32 and NodeMCU
• Analog output (pH, TDS, Turbidity) and digital output (DS18B20)
• Easy to connect with jumper wires, no soldering needed
• Good for IoT dashboard with Blynk, Firebase and ThingSpeak
• Saves money compared to buying each sensor separately

Specifications

Applications / Project Ideas

• IoT water quality monitoring system
• Fish pond and aquaculture monitor
• Drinking water purity checker
• River and drain pollution alert (with SMS)
• Hydroponics and aquaponics controller
• Smart water tank with LCD / OLED display

Important Usage Note

• Calibrate before use: pH needs pH 4.01, 6.86 and 9.18 buffer solution for accurate readings, and TDS needs a known ppm solution.
• Keep the pH probe wet (store in storage solution, not dry) and rinse all probes with clean water after use.
• pH and TDS probes in the same water can interfere with each other, so read them one after another (not at the same time) or keep them apart.
• Use the DS18B20 temperature to compensate TDS and pH readings.
• DS18B20 needs a 4.7K pull-up resistor between DATA and VCC.
• ESP32/NodeMCU use 3.3V logic, so scale the 5V analog output of the pH and turbidity modules with a voltage divider.
• Not for drinking-water safety certification, results are for learning and prototype use.

Package Includes

• 1 x pH Sensor (probe + module)
• 1 x TDS Sensor (probe + module)
• 1 x Turbidity Sensor (probe + module)
• 1 x DS18B20 Waterproof Temperature Sensor
• 1 x 4.7K resistor

Why Buy from Project Kits BD?
Genuine, tested components, student-friendly price and fast delivery across Bangladesh. Wiring, calibration ba code e help lagle amader team ache.