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Digital AC & Refrigeration system analyser
model TESTO 523


• Real-time superheat and subcooling readings
• Confidently charge at outdoor temperature down to 55°F
• 30 "P/T charts" built-in
• Digital readout of temperatures and pesssures
• One button MIN/MAX/HOLD
• Built-in lockable Carabineer/type hook
• Backlit sight glass
• 3-port, 2 valve manifold (1/4 SAE)
• Prints all data to testo printers
• Operating range 368/735 PSI low/high sides
• Compatible with all refrigerants except ammonia

testo 523 technical data
Pressure range 368/735 PSI low/high sides (25/50 Bar)
Pressure resolution 0.1 PSI (0.1 Bar)
Pressure overload 735/1470 PSI low/high sides (50/100 Bar)
Line temperature input 1, Pt 100
Temperature measurement range -58 to 392°F (-50 to 200°C)
Temperature resolution 0.1°F (0.1°C)
Pre-loaded refrigerants 30, factory upgradeable
Battery life 40 hours (4 AA) with backlight off
Weight (approx.) 3 pounds
Protection class NEMA 3/3S (IP 54)