Temperature Compensation)(This one has it it...most don't!).

 Just hang the 1m cable in your reservoir or pool etc. and mount

 the meter on the wall for precise accurate readings all the time.

Comes from the factory calibrated and ready to go. However you

 should recalibrate your meter every 6 months or less for

 greatest accuracy. TDS Calibration Solutions are available in my

 store as well (not included). 

You can run this unit with the power adapter or via the included

 batteries for wireless use!

Calibration: Manual, miniscrew driver provided 

Power Supply: 1.5V Batteries x 4 or Power adaptor (Both included!)