Iso Tech is the RS house brand instrument, nice enough and low cost units. Last one i bought was an ICM-A9 on clearance from RS. A nice clamp meter mostly aimed at electricians, as it has a range of 400A AC and an AC/DC range of 600V, with autoswitching between AC, Dc or resistance on the range, so no way to oops and blow it up, no voltage it goes to continuity, over around 2V it does AC or DC depending on what it sees and it has a low impedance input ( 30 seconds max for voltage mode) and if it detects over 0.6A in the jaw it changes to A. One button on the front panel, power and hold depending on how long you hold it down. All in all not bad for the price and quite me proof.