10 Best Refrigerant Leak Detectors 2025 in the United States

The Inficon AST 300 PPM Refrigerant Leak Detector is a solid choice for automotive professionals and DIY enthusiasts looking for an effective tool to identify refrigerant leaks. One of its standout features is its sensitivity, aided by a non-dispersive infrared sensor that helps reduce false alarms caused by common chemicals found under car hoods. This means you're more likely to detect actual leaks without unnecessary interruptions. Additionally, the PPM display provides clear visibility of the leak's concentration, making it easier to assess the situation accurately.

The device is designed with user convenience in mind. It comes with both automatic and manual zero modes, allowing for flexible operation based on your needs. The quick-charging lithium-ion battery is a bonus, ensuring you won’t be left in the lurch if the battery runs low, and the inclusion of a UV inspection light and R1234yf check gauge adds value for comprehensive leak detection.

However, there are a few drawbacks to consider. While the device is built with durability in mind, its performance can be influenced by environmental conditions, which may impact its response time in certain situations. Although it’s relatively easy to use, beginners might need time to familiarize themselves with all its features, particularly the sensor's sensitivity settings. Also, being battery-powered, it requires periodic charging, which could be inconvenient during intensive use.

The Inficon AST 300 PPM is well-suited for those needing a reliable refrigerant leak detector, especially in automotive settings. It provides a good balance of sensitivity and ease of use but may require some learning and periodic maintenance to keep it performing at its best.

The INFICON D-TEK Stratus Refrigerant Leak Detector is a portable monitoring tool designed for those needing efficient leak detection in refrigeration systems. With its two modes—Cloud Hunter for broader areas and Pinpoint for precise locations—it offers flexibility in how leaks are identified. One of its standout features is the redesigned infrared sensor, which claims the longest lifespan in the industry. This makes it a great long-term investment for professionals or DIY enthusiasts. The sensitivity of 0.03 oz/year ensures even minor leaks are detected, which is crucial for maintaining system efficiency.

Battery life is decent at around 9 hours, thanks to a new lithium-ion battery. This is usually sufficient for most jobs, but for extensive operations, you might need a backup. The ease of use is enhanced by features like automatic and manual zero modes, allowing for straightforward calibration.

The device’s reliance on a separate CO2 sensor for detecting CO2 leaks can add to overall costs. While the included components are handy, this product might not be the best fit for casual users who may find the advanced features overwhelming. Additionally, the weight is light and portable, but some users might prefer a more substantial build for added durability in harsher environments. The INFICON D-TEK Stratus is a great option for professionals seeking a reliable, sensitive, and versatile refrigerant leak detector, but those with casual needs or looking for a more robust option may want to consider other alternatives.

The Fieldpiece DRX3 is a versatile and user-friendly refrigerant and combustible gas leak detector, designed to meet the needs of HVAC professionals working with a wide range of refrigerants including A3, A2L, and A1 types. Its heated diode sensor is highly sensitive and reliable, capable of detecting small leaks quickly, which helps to speed up troubleshooting. The device offers adjustable sensitivity settings (high, medium, low) and both auto and manual zero modes, giving users flexibility to tailor detection to different environments.

Response time is fast, supported by multiple audio and visual indicators that clearly show leak intensity, making it easier to pinpoint problem areas. Battery life is solid with long-lasting, field-replaceable AA batteries included, so you won’t be interrupted during jobs. The detector’s lightweight and durable design adds to its convenience, ideal for fieldwork where portability matters. Additionally, it integrates with the Job Link System app, which can help streamline job management.

The device is moderately priced given its features, though its weight of about 3 pounds might feel a bit heavy compared to some ultra-light models. This leak detector suits HVAC technicians who need a dependable, adaptable tool for a variety of refrigerant types and appreciate clear, rapid leak detection coupled with durable build quality.