Horiba Scientific LAQUAtwin B-771 Instruction Manual page 45

 Do not measure samples such as the following, since they may
damage the sensor or shorten its life: Organic solvents, oils, adhesives,
cement, alcohols, concentrated acid (0 pH to 2 pH), concentrated
alkaline (12 pH to 14 pH) or solid materials.
 In the following cases, perform electrode surface treatment as
instructed on page 8.
・ The sensor is used for the first time.
・ The sensor is slow to respond, after several weeks of disuse, etc.
・The inside of the measurement cell is dirty.
・Bubbles tend to occur inside the measurement cell.
・The measured value is unstable.
 Battery
 Keep batteries out of reach of children. If someone accidentally
swallows a battery, call a doctor immediately.
 Do not throw batteries in fire.
 Do not attempt to recharge batteries.
 The provided batteries are intended for use in operation checking,
therefore their service life may be short.
 The battery alarm icon lights up when the battery voltage is low.
Replace the batteries when the battery alarm icon lights up. The meter
power may not be turned ON/OFF when the battery voltage is low.
 Replace the 2 batteries at the same time.
 Others
 Only use the product including accessories for their intended purpose.
 Wash off any calibration fluid that comes into contact with hands or
other exposed skin. If fluid gets in eyes, rinse them immediately and
see a doctor.
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