BUNDLE INCLUDES: Dwyer 475-6-FM Handheld Digital Manometer, Wrist Lanyard, 9V Battery, Operating Instructions and NIST Certificate of Calibration. The Dwyer 475-6-FM Handheld Digital Manometer features dual-range measurements, positive, negative, or differential pressures. Unit is compatible with air and natural gas. A Standard 9 Volt Battery provides up to 100 Hours of operation. Dual push pads on the front of the panel control On-Off, Auto Zero, and Pressure Unit Selection. NIST Certification is completed prior to shipment and is valid one year. The Dwyer Instruments Engineering Laboratory is accredited by the ANSI National Accreditation Board and meets the requirements of ISO/IEC 17025:2017 for select calibration services. Dwyer 475-6-FM SPECIFICATIONS: Dual Range: 0-30.00 psi (2.069 bar). Accuracy: ±0.5% Full Scale, 60 to 78°F (15.6 to 25.6°C); ±1.5% Full Scale from 32 to 60°F and 78 to 104°F (0 to 15.6°C and 25.6 to 40°C). Pressure Hysteresis: ±0.1% of Full Scale. Temperature Limits: 0 to 140°F (-17.8 to 60°C). Compensated Temperature Limits: 32 to 104°F (0 to 40°C). Storage Temperature Limits: -4 to 176°F (-20 to 80°C). Display: 0.42" (10.6 mm) 4-digit LCD. Power Requirements: 9 V alkaline battery, installed non-functional, user replaceable. Weight: 10.8 oz. (306 g). Process Connections: Two barbed connections for use with 1/8" (3.18 mm) or 3/16" (4.76 mm) I.D. tubing. Service: Air and compatible combustible gases. Agency Approvals: CE, FM.