Mastercool 99903-02 4-Valve Digital Manifold with Thermocouples

The Mastercool 99903-02 is a professional 4-valve digital manifold designed for HVAC and refrigeration technicians who need accurate pressure, temperature, superheat and subcooling readings with full Bluetooth data logging capability. Four valves give you independent control of each hose port — essential for precise charging and recovery work on modern systems.

Key Features

• 4-valve design: Independent control of each port for precise charging, recovery and evacuation
• Thermocouple inputs: Measure suction and liquid line temperatures directly for accurate SH/SC calculations
• Bluetooth connectivity: Pairs with the Mastercool Data Logger app for real-time monitoring and job reporting
• 60+ refrigerant database: Covers R32, R410A, R404A, R134a, R22, R407C, R448A, R449A, R452A and many more
• Automatic SH/SC calculations: On-screen superheat and subcooling — no manual chart lookups
• Large backlit display: Clear readings in any lighting condition, including tight plant rooms
• Durable construction: Built for trade use in demanding HVAC and refrigeration environments

Data Logger App

The Mastercool Data Logger app (iOS and Android) connects via Bluetooth to log readings over time, generate job reports, and share data with clients or supervisors. Ideal for commissioning documentation and compliance records.

Suitable For

• Split system and VRF commissioning
• Ducted system charging and fault diagnosis
• Light commercial and industrial refrigeration service
• Technicians requiring documented proof-of-work records

Related Products

Browse our full range of digital manifold gauges and refrigerant gauges, or explore all Mastercool HVAC tools at HVAC Supply Shop.

Ships Australia-wide from our Australian warehouse. Contact us for trade pricing and wholesale accounts.