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We purchased CyberScan 's "Lacomester pH meter (waterproof type) pHTestr 30" purchased about a year ago because it can not be calibrated normally. The pHTestr 20/30 has a measurement accuracy of ± 0.01, it is highly accurate for price, but I bought it, but it is to end sales. If the main unit fails, only products with measurement accuracy ± 0.1 pH are currently found, so we expect to resell products with measurement accuracy ± 0.01. In addition, electrode exchange was very easy.