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美國零長度金屬彈簧重力儀（ZLS） ?
1991年由Lacoste博士發起創辦了——零長度金屬彈簧重力儀（ZLS）公司。ZLS公司花費了6年以上的時間開發了這種新的金屬零長度彈簧重力儀—貝爾雷斯（Burris）重力儀。
貝爾雷斯（Burris）重力儀不是在過去Lacoste重力儀產品技術的重新包裝，而是采用了數字技術的最新發展，使得儀器具有最先進數字性能且易于使用，是目前市場上最準確、精確、耐用和快速讀數的重力儀。
通過UltraGravTMControl 電子裝置自動操控貝爾雷斯重力儀（Burris Gravity MeterTM）可以達到微伽級精度，作為Lacoste型號的升級換代產品，幾年來該產品銷售遍及世界各國，獲得了世界各國重力使用者的好評。
ZLS Corporation is a manufacturer of high precision, metal, zero-length spring gravity meters and products. Products include upgrades for LaCoste & Romberg marine and air gravity meters.
ZLS was founded in 1991 in response to a need for a high-quality company that would provide the latest in state-of-the-art technology for gravity meter instruments. The company was started in Austin, Texas by three individuals with experience in designing and manufacturing gravity meters: Dr. Adams, Larry Burris and Herbert Valliant. Dr. LaCoste suggested that the company be named after his Zero-Length Spring. The name was fitting and the three began working on their first product, an upgrade for LaCoste & Romberg (L&R) S-meters. Since its start, ZLS has continued to develop its products and services and now offers its own line of gravity meter products which include a land gravity meter (Burris Gravity Meter?) and a Marine / Airborne gravity meter (ZLS Dynamic Gravity Meter?). To continue servicing the gravity meter community ZLS also offers a range of state-of-the-art technology products for L&R G, D, ET, and S-meters.