Grounding resistance and circuit resistance test in flammable and explosive area. 1. Model No.: ETCR2000B+ 2. Resistance Measure Range: 0.010Ω~1200Ω 3. Data Storage: 99 sets 4. Alarm Threshold Setting:1-199Ω 5. Alarm Function: audible and visible alarm 6. Power Supply : DC: 6V ( 4 PCS LR6 Alkaline batteries)