TTL Technologies Pvt. Ltd. Manufactures Clamp Meters with Versatile and Rugged Tools. TTL Technologies Pvt. Ltd. Is an ISO/IEC 17025:2005 awarded company. The company manufactures Test Instruments. The Clamp Meters with Versatile and Rugged Tools take reliable readings with the True-rms, Fluke 355 and 353 digital clamp meters; the tools of choice for high current clamp-on amp meter measurement up to 2000 A. The extra-wide jaw easily clamps around large conductors, typically found in high-current applications. The extra rugged design and CAT IV 600 V, CAT III 1000 V ratings add an extra element of user protection when taking high-powered measurements.