Analog hanging spring scales with 25kg, 50kg, and 100kg capacities are versatile mechanical tools used in healthcare, agriculture, and industry. While the 25kg model is the "standard" for infant weighing, the 50kg and 100kg models are heavy-duty versions often used for older children or industrial loads.
1. Typical Specifications by Capacity (2026)
|
Capacity |
Graduation (Precision) |
Best Use Case |
Dial Diameter |
|
25 kg |
50g or 100g |
Newborns & Infants |
150 mm (6") |
|
50 kg |
200g or 500g |
Toddlers & Small Livestock |
170 mm (7") |
|
100 kg |
500g or 1 kg |
Heavy Industrial/Agricultural |
170–200 mm (8") |
2. Core Features (Analog/Mechanical)
- Pointer Display: Uses a high-visibility physical needle. Most dials are white with black or red increments for readability in low-light environments.
- Materials: * Housing: Usually powder-coated steel (Industrial models) or high-impact ABS plastic (Clinical models like Salter).
- Hooks: Dual-hook system with a galvanized steel top ring for hanging and a lower S-hook for weighing trousers or slings.
- Zero Adjustment (Tare): A manual knob at the top allows you to reset the needle to zero. This is essential for deducting the weight of the weighing "pants" or a heavy sling.
- Spring Mechanism: Uses a temperature-compensated mechanical spring. These require no batteries and are waterproof/splashproof.
3. Recommended Models (2026)
- Salter 235-6S (25kg): The medical gold standard. Features a shatterproof polycarbonate dial cover and is used globally by health organizations like UNICEF.
- NTA / Virgo Series (50kg/100kg): Common in agricultural and "business" settings. These often feature a brass-plated dial and more robust steel hooks to handle the heavier 100kg load.
+1
- Health O Meter 386KGS: A lightweight, portable option for travel and field clinics.
Important Considerations for Accuracy
Precision Warning: Analog spring scales are excellent for monitoring trends, but as the capacity increases (to 50kg or 100kg), the precision decreases. If you need to monitor a newborn's weight for medical issues, a 25kg scale with 10g or 50g divisions is much safer than a 100kg scale.
Parallax Error: To get an accurate reading, you must look directly at the pointer at eye level. Looking from an angle can lead to a misreading of several hundred grams.