The HST series tester was developed in response to the need for a safe and non-destructive means of testing rate compensated fire detectors. The tool consists of a special heater and control unit, specifically designed to be placed on top of a long reaching pole which is then raised up to the detector to be tested. The only portable rate compensated detector tester Light weight tool weighs under 2 pounds 2.7 Amp-hour long life battery Compatibility with the industry’s most common long-reaching poles and the unique test head design make it possible to easily slide the heating element around sensors up to 30 feet overhead. The temperature control unit maintains a safe, non destructive temperature by applying a measured amount of heat and provides visual indication of the temperature progress.