I have added 2 thick lines around the ball to mark the levels.
eBay
Dishwasher Dedicated Detergent Powerful Ball Multifunction Cleaning Tablets Sterilization Remove Dirt Block Home Supplies
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
10PCS 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
100/50Pcs Multi-purpose Strong Detergent 5 in 1 Detergent Liquid Capsule Ball Laundry Scent Fragrance Beads for Home Dormitory
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
50/150ML Clothes Stain Removal Rolling Ball Portable Stain Cleaning Detergent Decontamination Pen Cleaning Dust Cleaner Remover
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
Clothes Stain Removal Rolling Ball Portable Oil Stain Cleaning Detergent Decontamination Pen Dust Cleaner Remover 1/2/3/4/5/10pc
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
50ML Clothes Stain Removal Rolling Ball Portable Oil Stains Cleaning Detergent Decontamination Pen Cleaning Dust Cleaner Remover
Aliexpress UK
Precise Capacity and Clear Scaling: In this set, you'll get 4 dosing balls: two with a 50ml capacity and two with a 100ml capacity. Wash - Safe Design: Our dosing ball for liquid detergent, especially the laundry dosing ball, is crafted from high - quality.
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Clothes Stain Removal Rolling Ball Portable Oil Stain Cleaning Detergent Decontamination Pen For White T-Shirt Shoes
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
50 ml Effective Stain Treatmen Clothing Stain Removers Decontamination Ball Cleaner Stain No Wash Removers Beads Stain Detergent
Aliexpress UK