Weston clamp on ammeter Model 633 Type A-2. This can be used continuously up to 500 Amps.

Ranges: 10; 25; 100; 250; 500; 1000 Amps.

Analogue meter selector switch.

In good condition with no damage to the body or the clamping mechanism.

I have tested using Auto transformer at low currents on the first two ranges 10 and 25 Amps. see pictures.