DM sereis compact digital panel meter/Frequency/tachometr Features： Precise measuring ,reliable performance , compact figure:A:36H*72W;B:42H*79W; C:48H*96W decimal point setting freely Display Red LED Max.display 1999 (3 1/2); 19999 (4 1/2) Measuring mode Dual slope A/D conversion Sampling rate Abt.2.5/sec Overflow indication ?1攐r??3 1/2); ?000攐r?0000?4 1/2) LED flash Polarity display Only ?攄isplay power supply DC 5V ?0% ≤70mA(3 1/2); DC 5V ?.2V ≤80mA (4 1/2) Operating temperature and humidity 0～50℃ <85%RH Available model: DM3A/3B/3C--DV/DA__; DM4C--DV/DA_; DM4A/B-FR; DM5C-FR DE3A/3B/3C--DV/DA__; DE4C--DV/DA_; DE4A/B-FR; DE5C-FR