testo 512-1 Digital Differential Pressure Meter | 0–200 hPa, 0.001 hPa resolution at 0–2 hPa, Pitot tube air velocity, App connectivity

testo 512-1 Digital Differential Pressure Meter: 0–200 hPa, App Connectivity

Overview

The 512-1 is a testo digital differential pressure meter for checking flow and static pressure on gas appliances and differential pressure across HVAC filters; with a Pitot tube it also measures air velocity in ducts. The testo Smart App is used to configure the instrument, display readings (it can serve as a second screen), and save and log measurements; an audible alarm is provided. The 512-2 in the same series covers 0–2000 hPa; please inquire separately.

Key Specifications

• Measuring range: 0–200 hPa; overload ±500 hPa
• Accuracy: 0–25 hPa: ±(0.3 Pa + 1% of reading) ±1 dgt; 25.001–200 hPa: ±(0.1 hPa + 1.5% of reading) ±1 dgt
• Resolution: 0–2 hPa: 0.001 hPa; 2.01–20 hPa: 0.01 hPa; 20.1–200 hPa: 0.1 hPa
• Power and protection: 3 × AA, approx. 120 h; IP40
• Dimensions and weight: 146 × 60 × 28 mm, 190 g
• 512-2 (same series): 0–2000 hPa, 0.5% fs, 1 hPa resolution

Applications

• Pressure checks on gas appliances, HVAC filter differential pressure and duct air velocity measurement.

Specifications per the testo English website product pages for the 512-1 and 512-2 (retrieved 2026-10-21).