... operation, 3) CE/ROHS/ISO High Accuracy Pen-type PH Meter and temp meterPH-009(III) high accuracy pen type PH ... as probe. With 31/2 liquid crystal digits display, the meter is reliable, stable, portable, and convenient to operate, especially ... departments of medical treatment, environment protection, scientific research, college and mechanical plant etc. Model SV501(III) SV501(III)A Measuring range0 ...