Testo 510i Smart Wireless Differential Pressure Gauge
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
| Differential pressure (internal sensor) - Piezoresistive |
| Measuring range | -60 to +60 InH₂O / -150 to +150 hPa |
| Accuracy | ±0.02 InH₂O (0 to +0.4 InH₂O) / ±0.05 hPa (0 to +1 hPa) |
| ±(0.1 InH₂O + 1.5 % of mv) (+0 to +60 InH₂O) / ±(0.2 hPa + 1.5 % of
mv) (+1 to +150 hPa) |
| Resolution | 0.01 InH₂O / 0.01 hPa |
| General technical data |
| Weight | 3.25 oz. / 92 g |
| Dimensions | 6 x 1 x 1 in. / 148 x 36 x 23 mm |
| Operating temperature | -4° to 122 °F / -20 to +50 °C |
| Housing | ABS / TPE |
| System requirements | requires iOS 11.0 or newer; requires Android 6.0 or newer; requires
mobile end device with Bluetooth 4.0 |
| Product colour | black/orange |
| Battery type | 3 x AAA |
| Battery life | 150 h |
| Storage temperature | -4° to 140 °F / -20 to +60 °C |
