The digital pen style pH meter is an ideal instrument for aquarium, fishing industry, swimming pool, school laboratory, food & beverage etc. * 100% brand new meter with protective plastic case and calibration screwdriver * Excellent meter, very acurate and durable * The pocket digital pH meter introduces advanced technology and imported components, greatly reducing the volume and costs and maintains the existing good quality * Package included: 1 x Digital pH meter, 1 x Calibration adjustment screwdriver, 2 x Pouches of calibration buffer solution, 1 x User instruction