Testo 549i Smart High-Pressure Gauge for Refrigeration Systems
Product Introduction
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.
Product Features
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
Technical Specifications
| Pressure measurement |
| Measuring range | -15 to +870 psi / -1 to +60 bar |
| Accuracy | ±0.5 % of full-scale value |
| Resolution | 0.01 psi / 0.01 bar |
| Probe connection | 7 / 16 in. - UNF |
| Overload rel. (high pressure) | +943 psi / +65 bar |
| General technical data |
| Weight | 5.52 oz. / 156.6 g |
| Dimensions | 5 x 1 x 1 in. / 125 x 32 x 31 mm |
| Operating temperature | -4° to 122 °F / -20 to +50 °C |
| Housing | Plastic |
| Product colour | black/orange |
| Battery type | 3 x AAA |
| Battery life | 150 h |
| Pressure media | CFC, HFC, HCFC, N, H₂O, CO₂ |
| System requirements | requires iOS 8.3 or newer; requires Android 4.3 or newer; requires
mobile end device with Bluetooth 4.0 |
| requires iOS 11.0 or newer; requires Android 6.0 or newer; requires
mobile end device with Bluetooth 4.0 |
| Storage temperature | -4° to 140 °F / -20 to +60 °C |
