• Question 1: How to verify the accuracy of the temperature?
• Answer: The temperature measured by the gauge is allowed to deviate by 3% from the actual temperature. There is a simple way to verify the accuracy of the temperature: Take out the black wire on the temperature clamp and put it in the boiling water. If the temperature is 100 degrees Celsius or the error is plus or minus 3%, it is normal. NOTE: Please pay attention to temperature unit conversion between Celsius/Fahrenheit.
• Question 2: Why does the pressure value fluctuate slightly? Is it a leak or is the data inaccurate?
• Answer: According to the current level of hardware processing in the industry, it is difficult to achieve a 100% completely sealed valve on the market. The sealing degree of our guage hardware can only reach 99%. But these slight leaks will not affect the use.
• Question 3: Does this gauge have a micron reading function?
• Answer: No, the accuracy of this refrigerant manifold gauge can only reach the accuracy equivalent to this unit: -101 Kpa-0 Kpa.

Warmly Note: The HVAC guage will read random numbers when it is powered on. You must press the ZERO key to clear the numbers after you power it on, and then you can use it normally (It is not correct to use it directly without pressing the ZERO button). Before using the HVAC guage, please make sure that refrigerant hoses and temperature sensor clamps are connected properly. Poor connection of the temperature sensor clamps will make it impossible to read the temperature. Poor connection of the refrigerant hoses will cause refrigerant leakage.

Correct steps:

1. Power it on, then close the two valves, press the ZERO key to clear the reading.

2. Connect the three-color hoses, then open the valve, and use it normally.

Regarding the evaporation temperature, the condensing temperature is explained as follows:

1. Evaporating temperature: The lower the evaporating temperature, the lower the evaporating pressure and the refrigeration coefficient of the system. In this case, the load of the system continues to increase, which causes the energy consumption of the system to continue to increase.

2. Condensing temperature: The higher the condensing temperature, the higher the condensing pressure, the higher the compression ratio, the higher the shaft work, the lower the air delivery coefficient, the faster the actual exhaust volume deceleration, and the lower the cooling capacity.

Product specifications:

Pressure test: gauge pressure

Pressure test unit: Kpa; Mpa; bar; inHg; PSI.

Pressure test range: 0 Kpa ~ 6000 Kpa

Pressure test resolution: 1 Kpa

Pressure test accuracy: +/- 0.5 %(FS)+ 5dgt

Pressure overload limit: 10000 Kpa (10 Mpa; 100 bar;)

Temperature test unit: °C (Celsius), °F (Fahrenheit)

Temperature test range: -40°C~150°C (-40°F~302°F)

Temperature test resolution:

0.1°C (-40°C~99.9°C), 1°C (100°C~150°C)

0.1°F (-40°F~99.9°F), 1°F (100°F~302°F)

Temperature test accuracy:

+/- 0.5 °C + 2dgt

+/- 0.9 °F + 2dgt

Vacuum test: relative vacuum

Vacuum test unit: Kpa; Mpa; bar; inHg; PSI.

Vacuum test range: -101 Kpa ~ 0 Kpa

Vacuum test resolution: 1 Kpa

Built-in 89 kinds of refrigerant NIST: According to American NIST standard

Power Supply: 4pcs * 1.5V AA / LR6 batteries (Battery not included)

Dimensions: 170*110*50mm Weight: 950g

Refrigerant hoses connection and valve operation method of Vacuum Test:

1. Close blue valve tightly and do not connect any hoses to the corresponding inlet.
2. Connect the vacuum pump to the vacuum pump inlet of the refrigerant gauge with the yellow hose.
3. Open the red valve, connect the device under test with the corresponding red hose, and then you can start the vacuum operation.

(Note: In the vacuum operation, the blue valve does not work, only the red valve does. The blue valve needs to be closed. If the blue valve is not closed, the air pressure will escape from the blue valve and cause a leak, and the test data will be inaccurate.)

Compatible with 89 Kinds of Refrigerant: R11 R113 R114 R115 R116 R12 R123 R124 R125 R1270 R13 R134A R14 R141B R142B R143A R152A R170 R21 R218 R22 R227EA R23 R236EA R245CA R245FA R290 R32 R401A R401B R401C R402A R402B R403A R403B R404A R405A R406A R407A R407B R407C R407D R407E R408A R409A R41 R410A R410B R411A R411B R412A R413A R414A R414B R415A R415B R416A R417A R418A R419A R420A R421A R421B R422A R422B R422C R422D R423A R424A R425A R426A R427A R428A R50 R500 R501 R502 R503 R504 R507A R508A R508B R509A R600 R600A R717 R744(Co2) R1234

This HVAC gauge is for regular residential AC. It is suitable for all automobile air conditioner, household air conditioning, refrigeration equipment and cold storage.

Packing list：

1pc * HVAC Digital Refrigerant Gauge (Battery not included)

1pc * User Manual (in English)

2pcs * Temperature Clamps

3pcs * Refrigerant hoses

1pc * Suitcase