the image says the cells are 3.4mm across, it means 34mm right?

Yes the 1/2 bridge cell is 34mm x 34mm edge to edge

is a pressure sensor mandatory to make this work?

The 4 load cells included are the pressure sensors...

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4pcs DIY 110lbs 50KG Half-bridge Body Load Cell Weight Strain Sensor Resistance + HX711 AD Module

4pcs DIY 110lbs 50KG Half-bridge Body Load Cell Weight Strain Sensor Resistance + HX711 AD Module

Product ID: 146021581

📊HX711 AD module for precise digital readout

🔗Half-bridge strain gauge tech

⚖️50kg per sensor capacity

Description

⚙️ Elevate your DIY projects with pro-grade precision and scalable power!

COMPACT LIGHTWEIGHT - At just 80g and pocket-sized, perfect for sleek, space-conscious designs.
PRECISION ENGINEERING - 1000 Ohm half-bridge strain gauges deliver industry-grade accuracy for professional projects.
VERSATILE APPLICATION - Ideal for DIY smart scales, robotics, and industrial weight sensing—engineered for the future of measurement.
MODULAR WEIGHT SCALING - Combine up to 4 sensors for a max 200kg range—customize your measurement power.
PLUG PLAY INTEGRATION - Includes HX711 AD module and 10-pin needle for seamless digital conversion and easy setup.

This 4-piece set features 50kg half-bridge strain gauge load cells with a 1000 Ohm resistance, paired with an HX711 AD module for accurate digital weight measurement. Modular design allows combining sensors to measure up to 200kg, making it perfect for advanced DIY, robotics, and industrial applications.

Specifications

ASIN	B07TWLP3X8
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	84,324 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 277 in Pressure & Vacuum Measurement 941 in Sensors (Business, Industry & Science)
Customer Reviews	4.2 4.2 out of 5 stars (110)
Date First Available	3 July 2019
Guaranteed software updates until	unknown
Item Weight	80 g
Item model number	TS-YM-302
Manufacturer	Youmile
Package Dimensions	10.5 x 6.9 x 3 cm; 80 g
Part number	TS-YM-302

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