Apera EC20 Review: The Best Entry-Level Pocket Conductivity Tester for Hydroponics & Water Quality
A deep-dive review of the Apera EC20 — an entry-level pocket conductivity tester with a BPB platinum black sensor, wide 0–20 mS/cm range, 2-point auto calibration, and IP67 waterproofing for hydroponics, pools, and water quality testing.