Features: Able to measure the earth voltage and earth resistance by Bi-pole / Tri-pole method. Relative measurement: displaying the difference between the input value and the reference value. Able to select and review maximum、 minimum and average value. Data storage: storing up to 100 groups of measurement data. Data reading: to check the historical measurement data stored in the meter. Data deletion: to delete the data stored in the existing position. LCD display with analog bar and backlight. Low battery indication. Automatic power off to conserve battery power. Equipped with one tool bag for convenient carrying. Solid case is shake-proof and skid-proof. Note: Relative measurement is accessible only when the tester is used for earth resistance measurement. Specifications: Earth ground resistance Range Accuracy Resolution 029.99 ?Ħ(2%+6dgt) 0.01 3099.9 ?Ħ(3%+3dgt) 0.1 100999 ?Ħ(3%+3dgt) 1 1.00k4.00k ?Ħ(3%+3dgt) 10 By constant current inverter 800Hz / 3mA Earth voltage Range Accuracy Resolution 0V200V(5060Hz) ?Ħ(1%+5dgt) 0.1V Power supply 6 * AA 1.5V battery (not included) Temperature for measurement 0 40 Humidity for measurement Relative humidity under 85% Temperature for storage -10 50 Humidity for storage Relative humidity under 85% Tester size 19.5 * 15 * 7cm / 7.7 * 5.9 * 2.8in Tester weight 820g / 29oz Package size 34 * 26.5 * 10.4cm / 13.4 * 10.4 * 4.1in Package weight 2882g / 101.6oz Package including: 1 * Earth Resistance Tester 2 * Iron Rod 3 * Test Lead 1 * Belt 1 * Tool Bag 1 * User Manual (English)"