Model 4000 Snow-Therm Infrared Temperature Sensor   4000 Snow-Therm Fixed Mounted Infrared Temperature Sensor for Measurement of Snow 4000.3ZL Digital/Analog Low-Temperature Fixed-Mounted Infrared Temperature Sensor 4000.3ZH Digital/Analog High-Temperature Fixed-Mounted Infrared Temperature Sensor 4000.4ZL Analog Low-Temperature Fixed-Mounted Infrared Temperature Sensor 4000.4ZXL Fast-Response Analog Low-Temperature Fixed-Mounted Infrared Temperature Sensor 4000.4ZH Analog High-Temperature Fixed-Mounted Infrared Temperature Sensor 4000.4ZXH Fast-Response Analog High-Temperature Fixed-Mounted Infrared Temperature Sensor 4500.1ZL Low-Temperature Fixed Mounted Infrared Temperature Sensor with Embedded Data Logger and Sky Spy System