Eagle Y138D insulation tester. This is my spare which i never use hence sale. Ran it up and tested it all functional. Takes 8x AA batteries not included.

Professional auto ranging insulation tester. The unit features 40 segment analogue display, 4000 count LCD display, test hold function for easy operation, easy to carry testing package, discharge indication beeper, >1 mA test current for M Ohm range at rated Voltage, >200 mA short current for continuity range. Complies with IEC 1010 600 V CATIII and 1000 V CATII.
Insulation Range4000 M Ohm/250 V, 4000 M Ohm/500 V, 4000 M Ohm/1000 V
DC Voltage Range (V)600 V max.
AC Voltage Range600 V max.
Batteries8 x AA
Product Dimensions (mm)205x165x70
ColourGrey
Depth (mm)70
Height (mm)205
Net weight (kg)0.970
Width (mm)165