In the phase line where the board is open lamp hold will not work at 440 V bulb will be damaged whereas 3 in 1 tester will indicate this different phase of 440 V by glowing more brightly.
If we get phase from one wire and at the other end bulb does not glow indicating wires are from the same phase.
| PROD. NO. | Handle | TIP SIZE B x T |
C | L | WT.GMS |
| 817 – 1413 Ext. Cord. | Yellow | 3.5 x 0.5 | 14 | 1200 | 65 |
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