Get a truncheon stick... they seem to be really durable and easy to use.

example #1: ec/ppm meter
Original Truncheon Meter (EC/PPM)

example #2: pH
Bluelab Instruments pH Truncheon Meter: J from Kalyx.com - Hydroponics & Gardening - Testing, pH, TDS, EC

They're a bit pricey, but well worth it, and you didn't say "cheap." Maybe even go ahead and order some replacement parts to save some heartache and shipping in the future

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