The TM-3 three-scale thermistor temperature monitor (photo) is portable and features Celsius, Fahrenheit and Kelvin scales in a large, easy-to-read display. The temperature ranges are 0 – 104°C, 2 – 220°F and 256 – 378K. With an analog output, the TM-3 can be used with data acquisition systems or pen recorders. The thermometer is dust-proof, splash-proof and battery powered, making it ideal for field use. The meter operates for approximately 100 h with a single 9-V alkaline battery or it can be powered from the supplied a.c. wall adapter. — Warner Instruments, Hamden, Conn.