Test Products International | USA Handheld Test & Measurement Equipment What's New Featured Products Industry Leading Flue Gas Analyzers. Powerful Low Cost Vibration Meters. The best value in handheld test and measurement equipment. FEATURED PRODUCTS Product Documentation and Demonstration Videos At Your Desk Or In The Field Browse Product Videos Test the TPI Advantage! Industry leading handheld test & measurement equipment, value priced and ready to help you perform your task expertly, quickly, and profitably. Why TPI? Value. Performance. Service. Safety. TPI Analyzers, Meters, Machine Health Monitoring Tools and Industrial Instruments get the job done. Condition Based Monitoring Bearing and Lubrication Problems? High Maintenance Costs? Reliability Issues?. The TPI Solution: Condition Based Machinery Monitoring and Vibration Analysis.