Measure the Most Important Plant Growing Conditions in One Economical Meter
All you need to do to take measurements with this analog meter is to insert it in the soil and move the switch to the factor you want to test. It will measure the amount of fertilizer (too little, ideal, too much), light (0–10), moisture (1–4), and pH (0–9.0). It doesn't even require batteries. Size: 4 3/8"L x 2 1/2"W x 1 1/4"D.