The Fluke 28 II True-RMS Rugged IP 67 Industrial Digital Multimeter defines a new standard for operating in harsh conditions, with both the features and accuracy to troubleshoot most electrical problems. The 28 II has an IP 67 (waterproof and dustproof) rating, MSHA approval, extended operating temperature range of -15 °C to +55 °C (5 °F to 131 °F, -40 °C for up to 20 minutes) and 95% humidity, designed and tested to withstand a 3 m (10 ft) drop. The 28 II is built to work in the toughest environments.