- Extech 407228
- Extech DO700
- Extech Oyster-10
- Extech Oyster-15
- Extech Oyster-16
- Extech PH100
- Extech PH110
- Extech PH210
- Extech PH220-C
- Extech PH220-S
- Extech PH300
- Extech PH50
- Extech PH60
- Extech PH90
- Extech RE300
- Extech SDL100
- Extech WQ500
- Extech WQ500
- Extech WQ530