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✅ Blue-Lab EC SOLUTION: 500ml calibration fluid with EC value of 2.77 - perfect for EC meter calibration solution. ✅ EASY TO USE: No mixing required - can be used directly for reliable calibration. ✅ UNIVERSAL USE: Suitable for all EC meters and brands - flexibility guaranteed. Durable and economical: long-lasting durability and very economical – you can enjoy the solution for a long time. High accuracy: ensures precise measurement results and reliable calibration of your EC meter.