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| Air conditioner refrigerant Gas Leak detector |
| Model | ST312 |
| Sensor | Semiconductor |
| Refrigerants | R-22, R-134a, R-404a, R-410a and all CFCs, HCFCs, HFCs |
| Sensitivity Levels | High 0.15 oz. / year (4 g/ year) Medium 0.25oz. / year (7 g/ year) Low 0.50oz. / year (14 g/ year)(Compatible with SAE J2791 ) |
| Reset | Automatically reset to background level |
| Selectable Refrigerants | - |
| Display | LED |
| Response Time | Less than 0.5 second |
| Warm Up Time | Approx. 45 seconds |
| Battery Type | DC 3.7 V, 800 mAh rechargeable lithium battery |
| Battery Life | Approx. 2.5 hours continuous use when fully charged |
| Charging Time | 3 hours in all @ 400 mA, 0~45°C(32~113°F) |
| Audio Alarm | Yes (Buzzer) |
| Pump System | Yes |
| Auto Power Off | 10 minutes of idle |
| Low Battery Indicator | Yes |
| LED Tip Light | Yes |
| Flexible Probe Length | 450 mm (17.22") |
| Operating Temperature and %RH | 0~50°C (32~122°F), < 80% RH |
| Storage Temperature and %RH | -10~60°C (14~140°F), < 70% RH |
| Dimensions | 184x70x40 mm(7.24"x2.76"x1.57") |
| Weight | 300 g(10.7 oz.) |
| Accessories | Instruction manual, Carring case, AC adapter, Leak test bottle, Holster |

| Model | ST318 | ST310 | ST316 |
| Sensor | Infrared | Semiconductor | Infrared |
| Refrigerants | R-12, R-22, R32, R-134a, R-1234yf, R-404a, R-407c, R-410a, R-507(AZ-50) and all CFCs, HCFCs, HFCs and HFOs | R-22, R-134a, R-404a, R-410a and all CFCs, HCFCs, HFCs | R-22, R-134a, R-404a, R-410a, R-507(AZ-50) and all CFCs, HCFCs, HFCs |
| Sensitivity Levels | CM 0.10 oz. / year (3 g/ year) High 0.15 oz. / year (4 g/ year) Medium 0.25 oz. / year (7 g/ year) Low 0.50oz. / year (14 g/ year) (Compatible with SAE J2791 / SAE J2913) | High 0.25 oz. / year (7 g/ year) Medium 0.50 oz. / year (14 g/ year) Low 0.99 oz. / year (28 g/ year) | High 0.15 oz. / year (4 g/ year) Medium 0.25 oz. / year (7 g/ year) Low 0.50 oz. / year (14 g/ year)(Compatible with SAE J2791 / SAE J2913) |
| Reset | Automatically reset to background level | Manually reset to background level | Automatically reset to background level |
| Selectable Refrigerants | R-22, R32, R-134a, R-1234yf, R-404a, R-407c, R-410a and other | - | N/A |
| Display | Color LCD | LED | LED |
| Response Time | Less than 1 second | N/A | Less than 1 second |
| Warm Up Time | 30 seconds | Approx. 90 seconds | 30 seconds |
| Battery Type | DC 3.7 V, 1800 mAh rechargeable lithium battery | 9V battery | DC 3.7 V, 1960 mAh rechargeable lithium battery |
| Battery Life | Approx. 5 hours continuous use when fully charged | Approx. 13 hours continuous use when fully charged | Approx. 5 hours continuous use when fully charged |
| Charging Time | 6 hours in all @ 400 mA, 0~45°C(32~113°F) | N/A | 6 hours in all @ 400 mA, 0~45°C(32~113°F) |
| Audio Alarm | Yes (Buzzer) | Yes (Buzzer) | Yes (Buzzer) |
| Pump System | Yes | N/A | Yes |
| Auto Power Off | 10 minutes of idle | 10 minutes of idle | 10 minutes of idle |
| Low Battery Indicator | Yes | Yes | Yes |
| LED Tip Light | Yes | Yes | Yes |
| Flexible Probe Length | 450 mm (17.22") | 450 mm (17.22") | 450 mm (17.22") |
| Operating Temperature and %RH | 0~50°C (32~122°F), < 80% RH | 0~50°C (32~122°F), < 80% RH | 0~50°C (32~122°F), < 80% RH |
| Storage Temperature and %RH | '-10~60°C (14~140°F), < 70% RH | '-10~60°C (14~140°F), < 70% RH | '-10~60°C (14~140°F), < 70% RH |
| Dimensions | 184x70x40 mm(7.24"x2.76"x1.57") | 184x70x40 mm(7.24"x2.76"x1.57") | 184x70x40 mm(7.24"x2.76"x1.57") |
| Weight | 435 g(15.34 oz.) | 280 g(10.0 oz.) | 300 g(10.7 oz.) |
| Accessories | Instruction manual, Carring case, AC adapter, Leak test bottle, Holster, Porex Filters(2pcs), Car charger | Instruction manual, Carring case,Leak test bottle, Holster | Instruction manual, Carring case, AC adapter, Leak test bottle, Holster, Porex Filters(2pcs) |
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