Testo 510i Smart Wireless Differential Pressure Gauge

The Testo 549i is a compact, smartphone-operated high-pressure gauge designed for wireless diagnostics of air conditioning and refrigeration systems. With a measurement range of -15 to +870 psi (-1 to +60 bar), it enables precise pressure monitoring while eliminating the need for traditional hoses—reducing refrigerant loss during servicing. Controlled via the testo Smart Probes App, it auto-calculates evaporation/condensation temperatures and supports real-time data visualization, making it an essential tool for mobile technicians.

Measurement Capabilities

Wide Pressure Range:

-15 to +870 psi (-1 to +60 bar) with ±0.5% full-scale accuracy.

0.01 psi/bar resolution for detailed readings.

Hoseless Design:

Direct connection to 7/16 in. UNF pressure ports, minimizing refrigerant loss.

Media Compatibility:

Suitable for CFC, HFC, HCFC, nitrogen, water, and CO₂ systems.

Wireless Connectivity & App Functions

Bluetooth 4.0 Integration:

Pairs with iOS/Android devices (range ~65 ft/20 m) for remote operation.

testo Smart Probes App:

Auto-calculate evaporation/condensation temperatures.

Data display as graphs/tables; export to PDF/Excel.

Real-time monitoring for hard-to-reach pressure ports.

Design & Usability

Portable & Lightweight:

5×1×1 in. (125×32×31 mm), 5.52 oz (156.6 g) for one-handed use.

45° connector allows easy access to tight spaces.

Battery & Durability:

3x AAA batteries (150-hour life).

Operating temp: -4 to 122°F (-20 to 50°C).

Included Components

Testo 549i high-pressure gauge

Batteries

Calibration protocol

Quick start guide