The MIT330 features 250, 500 & 1000V insulation ranges, audible continuity test with adjustable buzzer, download of data via USB and a safety interlock system which prevents unsafe connection of test leads.
eBay
1Pcs 2040 V/T-Slot Aluminum Profile Extrusion 100 200 300 400 500 -1000mm Aluminum Extrusion Rail 20x40mm for DIY 3D Printer CNC
Aliexpress UK
Perfect as a steampunk, retro, or industrial style feature light – a real conversation starter and piece of engineering history. Originally used to test electrical insulation, this piece has been cleverly converted into a working lamp with a modern UK plug and bulb holder.
eBay
2Pcs 2040 T / V-Slot Aluminum Profile Extrusion 100 200 300 400 500 -1000mm Aluminum Extrusion 20x40mm for CNC 3D Printer Parts
Aliexpress UK
2500V +10%. 1000V +10%. 1 x Tester with Protective Cover. Short circuit current. 250KΩ load. Rated test current. ♦ Product size: 165 105 63mm (including protective cover). ±(2%+3dgt).
eBay
4pcs/lot 2020 Aluminum Profile V/T Slot 200 300 350 400 450 500 550 600 mm Linear Rail Extrusion Extrusion CNC 3D Printer Parts
Aliexpress UK
The Digital Insulation Resistance Tester by LYCEBELL is a reliable Megger Megohmmeter designed to accurately measure insulation resistance levels with a test voltage range of 1MΩ - 200GΩ. This model, LC-6688B, is compact in size with dimensions of 10.28x9.33x3.39 inches and lightweight at 2.87 pounds, making it easy to handle and transport. With resistance ranges of 500v, 1000v, 2500v, and 5000v, this tester is ideal for professionals in the electrical industry to ensure a safe and reliable insulation resistance level in various applications.(wh)
eBay
Eversheds & Vignoles Ltd. All told it is a nice original example, probably 1940's or 50's.
eBay
eBay
Megger Bm404/2, 500 V IR Tesrer
eBay
Test Current: 250V(R=250KΩ)1mA, 500V(R=500KΩ)1mA, 1000V(R=1MΩ)1mA, basic accuracy: ±10%. Insulation Resistance: 250V:1MΩ ~200MΩ, 500V:1MΩ ~200MΩ, 1000V:10MΩ ~2000MΩ, basic accuracy: ±(4% reading ±2 words).
eBay