Testo 176 T4 – Temperature data logger , Channels 4 x external Battery type 1 x Lithium (TL-5903) (3.6 Volt) Battery life 8 years at 15 min. meas. rate Operating temperature -20 to +70 °C Storage temperature -40 to +85 °C Dimensions 103 x 63 x 33 mm Protection class IP65 Measuring rate 1 s – 24 h Memory 2 million measurement values , 1. Professional software with Excel export function for programming the logger and data analysis 2. For measuring and logging the temperature at four different sites simultaneously 3. Temperature measuring range from -200 °C to +1000 °C 4. Easy-to-change battery 5. Automatic measuring data backup when the battery runs out or is changed 6. Displays violations of limit values. 7. with Four Probes TEST Part 0602 0645