TPI is known by many professionals as the "Safety Green Meter Company". Our safety green instruments are easily recognizable and stand for Value and Safety. Most products are Listed to US and Canadian standards (cULus) and are backed by a 3 year no hassle warranty. The TPI product line includes Digital Multitesters, Digital Clamp-on Testers, Thermometers, Oscilloscope Probes, Connector Kits, Test Lead Sets and Accessories, Gas Analysis Instruments, Hand Held Oscilloscopes and BNC Cables. Collateral materials and repair centers at every location. Our Website Additional Content TECHNICAL NOTES 1010A Ambient Air Reset 306C and 306XC Field Calibration 310C Field Calibration 312C Field Calibration 314C Field Calibration 315C Field Calibration 316C Field Calibration 320C Field Calibration 341K Field Calibration 343 Field Calibration 367D Field Calibration 555 / 565 / 575 / 595 RS232 Communication 605 Vacuum Gauge 775 Sensor Locations and Function A251 Clamp Adapter A256/A296 Clamp Adapters Analyzers and Testing Water Heaters and Appliances Analyzers: CO Error at Start-up Analyzers: CO Sensor NO/NOx Filtering Auto Range Meter DC Volt Range Zero Carbon Monoxide Levels Coal-Fired Stove Draft Measurement Location Combustible Gas Leak Detectors List of Detectable Gases Combustion Analyzer Formulas Combustion Analyzer Sensor Care Digital Multimeter DMM Low-Resistance Measurements Infrared Thermometers and Emissivity IP Ratings Measuring Capacitance Measuring Capacitance with the TPI 270 Measuring Voltage and Amperage Refrigerant Leak Detector Sensor Protection Test Instrument Fuses Using TPI Differential Manometers PRODUCT INFORMATION 715K3 High CO and NOX Analyzer Kit ADDITIONAL RESOURCES Vibration Analysis and Testing Precision Measuring Tools 183A Digital Multimeter Overview Selector Guide Frequently Asked Questions BROCHURES AND CATALOGS Condition Based Monitoring Full Line Catalog HVACR Catalog Instrument Catalog