VARIABLE POWER SUPPLY : 0 30V ; 1A ; SINGLE VARIABLE POWER SUPPLY : 0 30V ; 2A; SINGLE VARIABLE POWER SUPPLY : 0 30V ; 1A ; DUAL VARIABLE POWER SUPPLY : 0 30V ; 2A; DUAL VARIABLE POWER SUPPLY : 0 300V ; 1A 2A; MULTI OUTPUT POWER SUPPLY : 0-30V, 1A 2A +5V, 1A 2A +- 15V, 1A 2A