| Models | High Precision Deacde Resistance Box:7400 | PT 100 Simulator:7401 | High Stablity Decade Meghom Box:8400 (Economy model) | High Stablity Decade Meghom Box:8400 Hv |
| Types | Silver-to-Silver or Gold plated Switches and Terminals | Simulating wiring | Portable | Portable, 5 KV Model |
| Construction | Portable in metallic cabinet | - | Portable in metallic cabinet | Portable in metallic cabinet |
| Function | Calibration Resistance Standard | - | Resistance Calibration Standard | Resistance Calibration Standard |
| Resistance Range | 0.01 ohm to 100 Kohm in seven decades | - | 0.1 Megohm to 10 Giga Ohm (In five decade dials) | 0.1 Megohm to 1000 Giga Ohm (In seven decade dials) |
| Switch Resistance | 0.002 ohm per switc | up to 25 ohm | +/- 2% uptil 1 Giga ohm +/- 5% from 1 Giga Ohm to 10 Gigaohm range | +/- 2% uptil 1 Giga ohm +/- 5% from 1 Giga Ohm to 1000 Gigaohm range |
| Total Available Resistance | 111.1111 K. ohm | - | 11.111 Giga Ohm | 1111.111 Giga Ohm |