DIGITAL EARTH RESISTANCE TESTER MATRIX
MODEL	1120 ER	ST-1520	1820 ER	2120 ER	4120 ER
Earth Resistance Test	20/200/2000Ω	20/200/2000Ω	20/200/2000Ω	20/200/2000Ω	20/200/2000Ω
Earth Voltage Test	200V	200V	200V	200V	200V
Terminal	3	3	3	3	3
Display (counts)	2000	2000	2000	2000	2000
Data Hold	√	√	√	√	√
Auto Power Off	—	√	—	—	—
Low Batter Indication	√	√	√	√	√
Over Range Indication	√	√	√	√	√
Open Circuit Indication	√	√	√	√	√
Water Proof	—	—	√	—	—
CE Approved	√	√	√	√	√