# Weighing Scales for Dravya Medicinal Substances

> Weighing Scales for Dravya Medicinal Substances (Sanskrit: Tula Yantra / Tulasya) is an instrument used in diagnostic instruments. Precision weighing scales used for measuring exact quantities of medicinal substances (Dravya) according to Ayurvedic posology. Traditional scales used specific Ayurvedic weight units (Pala, Karsha, Tola, Ratti/Gunja).

## Key facts

- **Sanskrit name:** Tula Yantra / Tulasya
- **Ayurvedic category:** Diagnostic Instruments

Precision weighing scales used for measuring exact quantities of medicinal substances (Dravya) according to Ayurvedic posology. Traditional scales used specific Ayurvedic weight units (Pala, Karsha, Tola, Ratti/Gunja).

## Where is it described in the classical texts?

Charaka Samhita Kalpasthana and Sharangdhara Samhita Purva Khanda describe detailed posology and weight measurements. Rasaratna Samuchaya and Rasa Tarangini describe Tula Yantra as essential Rasashastra equipment.

## How is it used traditionally?

Precise measurement of herbs, minerals, metals, and other ingredients for Ayurvedic medicine preparation. Critical for Rasashastra (mineral/metal medicine) preparations where precise dosing is essential.

## Traditional materials

- Brass (Pittala) balance beam and pans
- Iron weights
- Standard seeds (Gunja/Ratti) as reference weights

## Modern variants

- Digital analytical balances
- Electronic precision scales
- Calibrated pharmaceutical weighing systems

## Regulatory status

- **India Cdsco:** Weighing instruments regulated under Legal Metrology Act, not CDSCO. Must be calibrated and certified.
- **Us Fda:** Pharmaceutical scales are subject to FDA GMP requirements (21 CFR Part 211) for drug manufacturing but not classified as medical devices.
- **Eu Mdr:** Not classified as medical devices. Subject to EU Measuring Instruments Directive.

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Published by Age Ayurveda in the Nighantu. Educational reference only, not medical advice.
Incorporates material from the Amidha Ayurveda Herb Database under CC BY 4.0.