# Lonetti

> Argentine manufacturer (since 1960) of prover tanks, test measures, water draw systems, tanker truck calibration towers, calibration test benches, and minilab systems for the petroleum and metrology industries. Custom-built to OIML R 120, API MPMS, and NIST standards. INTI-certified. Exporting to 47 countries.

## Products

- [Prover Tanks](https://lonetti.com.ar/prover-tanks): Stainless steel (304 SS) and carbon steel prover tanks from 50 L to 5,000 L+, built to OIML R117 and API MPMS Chapter 4.4. Used for flow meter calibration, custody transfer, and fiscal measurement in oil terminals, refineries, and metrology labs. Accuracy ±0.05%. INTI-certified.
- [Test Measures](https://lonetti.com.ar/test-measures): Field standard test measures for fuel dispenser calibration and custody transfer verification. Portable volumetric standards built to OIML R 120 and API MPMS. Used to verify fuel dispensers, small flow meters, and field calibration applications.
- [Water Draw Systems](https://lonetti.com.ar/water-draw-systems): Complete water draw calibration systems for pipe provers and tank provers. Designed for petroleum terminal applications requiring traceability to OIML and API standards.
- [Tanker Truck Calibration Towers](https://lonetti.com.ar/tanker-truck-calibration-towers): Calibration towers for road tanker and cistern truck verification. Built to legal metrology requirements for custody transfer and commercial measurement.
- [Calibration Test Benches](https://lonetti.com.ar/calibration-test-benches): Laboratory and industrial calibration test benches for flow meters, dispensers, and volumetric standards. Custom configurations available.
- [Minilab](https://lonetti.com.ar/minilab): Compact portable calibration laboratory systems for field and in-situ meter verification applications.

## Industries

- [Oil & Gas](https://lonetti.com.ar/industries/oil-gas): Prover tanks, water draw systems, and calibration equipment for petroleum terminals, refineries, and pipeline operators. Custody transfer measurement per API MPMS and OIML standards.
- [Chemical Industry](https://lonetti.com.ar/industries/chemical): Volumetric calibration equipment for chemical process measurement and fiscal metering.
- [Water Utilities](https://lonetti.com.ar/industries/water-utilities): Test measures and calibration systems for water meter verification and utility measurement.
- [Government & Legal Metrology](https://lonetti.com.ar/industries/government-metrology): OIML-compliant equipment for national metrology institutes and legal metrology authorities.

## Standards & Compliance

- OIML R 120: Lonetti prover tanks and test measures comply with the International Organization of Legal Metrology Recommendation R 120 for standard capacity measures used in custody transfer.
- OIML R117: Compliance for dynamic measuring systems for liquids other than water.
- API MPMS Chapter 4.4: Compliance with the American Petroleum Institute Manual of Petroleum Measurement Standards for small volume provers.
- NIST HB 105-3: Compliance with NIST Handbook 105-3 for standards used in verifying liquid-measuring devices.
- INTI certification: All Lonetti equipment is calibrated and certified by Argentina's National Institute of Industrial Technology (INTI), traceable to international metrology standards.

## Company

- [About Lonetti](https://lonetti.com.ar/about): 65+ years of precision liquid calibration manufacturing. Founded in Buenos Aires, Argentina in 1960. Exports to 47 countries across Latin America, North America, Europe, Africa, and the Middle East.
- [Services](https://lonetti.com.ar/services): Engineering consultation, custom manufacturing, calibration certification, after-sales technical support, and spare parts.
- [Contact](https://lonetti.com.ar/contact): Email info@lonetti.com.ar — WhatsApp +54 9 11 2788 4190.
- [FAQ](https://lonetti.com.ar/faq): Common questions about prover tank calibration, sizing, materials, standards, and lead times.

## Languages

This site is available in English (default), Spanish (/es/), and Portuguese (/pt/).