I have added 2 thick lines around the ball to mark the levels.
eBay
1-6PCS Eco-Friendly Wash Ball - Washing Machine Non-Chemical Detergent Laundry Ball Household Eco Hi-Ball
Aliexpress UK
Here for sale are a pair of Laundry Balls.Made in sunny Blackpool, UK. So you get two balls which totals 108 MLS of liquid you can put in your washing directly via these little blue balls. There is a seam on one side of them, as per photo.
eBay
Dishwasher Dedicated Detergent Powerful Ball Multifunction Cleaning Tablets Sterilization Remove Dirt Block Home Supplies
Aliexpress UK
Detergent & Softener Dispenser: Releases laundry liquid evenly during wash. Made from durable, reusable materials, the laundry ball is gentle on fabrics and easy to fill, making it an eco-friendly and cost-effective alternative to single-use detergent pods.
eBay
10PCS Dishwasher Dedicated Detergent Powerful Ball Multifunction Cleaning Tablets Sterilization Remove Dirt Block Home Supplies
Aliexpress UK
This liquid adding Laundry ball is a multifunctional auxiliary tool for laundry, which can effectively filter, remove hair and wash clothes. It adopts a unique design that allows for easy addition of laundry detergent or laundry softeners, making clothes softer and more comfortable.
eBay
Can Add Detergent, Stain Remover Laundry Ball Anti Entanglement Washing Machine Filter Bag Cleaning
Aliexpress UK
This liquid adding Laundry ball is a multifunctional auxiliary tool for laundry, which can effectively filter, remove hair and wash clothes. It adopts a unique design that allows for easy addition of laundry detergent or laundry softeners, making clothes softer and more comfortable.
eBay
Eco Friendly Washing Machine Balls Reusable Washer Ball Chemical Free Laundry Detergent Alternative for Washing Machine
Aliexpress UK
Washing detergent measuring balls x3 Condition is very good but Used Approx 7.5cm height and 7cm diameter at the widest point 60-140 ml lined dosage points
eBay
30/50pcs Laundry Beads Deep Cleaning Stain Removal Multi-purpose Strong Aroma Liquid Capsule Ball Concentrated Clothes Detergent
Aliexpress UK
Persil Liquid Detergent Dosing Ball – Washing Machine Laundry Measuring Cup – Reusable - Never used This genuine Persil dosing ball is ideal for measuring and dispensing the right amount of liquid detergent for your laundry. Made from durable, reusable plastic, it's eco-friendly and easy to clean. Key Features: Brand: Persil Condition: Lightly used Measures in 10ml increments from 30ml to 80ml Reusable and eco-friendly Ensures accurate detergent dosage Suitable for most washing machines Perfect for everyday laundry use, helping you get the best results while avoiding waste.
eBay
50Pcs 5 in 1 Laundry Scent Fragrance Beads Multi-purpose Strong Detergent Laundry Aroma Liquid Capsule Ball for Home Dormitory
Aliexpress UK
The INCREDiBALLS Scented Laundry Washing Balls Refill Pack by airpure is an eco-friendly laundry detergent in pellet form designed for use in washing machines. Each pack contains 4 balls with a capacity for 51-60 washes, providing a powerful cleaning solution for your laundry needs. The scented option in "clean skies" offers a fresh and pleasant aroma while the blue colour adds a fun touch to your washing routine. Manual operation makes it easy to use, making this product a convenient and sustainable choice for your household laundry needs.
eBay
30/50Pcs Laundry Gel Beads 7 in 1 Fragrance Multi-purpose Strong Detergent Laundry Aroma Liquid Capsule Ball for Home Dormitory
Aliexpress UK