Fluke 27-II Industrial Multimeter with IP67 ratingFluke 27 II Industrial Multimeter with IP67 rating The new standard for rugged Fluke 27 II and Fluke 28 II digital multimeters define a new standard for operating in harsh conditions with the features and accuracy to troubleshoot most electrical problems. Both meters have IP 67 (waterproof and dustproof) rating, MSHA approvals (pending), 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,