Lab Grade pH Probes tend to last longer, give more accurate results, stay calibrated longer, and need replaced less frequently.
Buy this probe if you are:
- Buying an Apex Lite (it does not include a pH probe)
- Replacing a worn out pH probe (we recommend you replace your pH probe every 18 months).
- Adding another tank to your system and purchased a PM1 to do so.
- Want to have a back-up probe on hand