pH calibration solution set or pH buffer set is needed to calibrate meters for extra precision before measurement.
This pH solutions set is ideal for calibrating LAQUAtwin pH meters in two points (pH4 and pH7) for extra precision. This set was designed for intensive testing and will last for 300 calibrations (for each concentration) of LAQUAtwin meters.
We recommend calibrating your LAQUAtwin meters daily (if you measure daily) or after every 10 measurements within a single day if you are testing more intensively.
 
⚫ Set of pH solutions (pH 4 and pH7) for LAQUAtwin meter calibration
⚫ Volume: 60 ml bottle x 2 
⚫ Calibration certificate available on request
⚫ Will last up to 300 calibrations
⚫ Made in USA

Compatible with HORIBA LAQUAtwin pH meter PH-11 / PH-22 / pH-33 , Hanna Instruments models HI98107 / HI98128 / HI98103 / HI98118/ HI98100 / HI98121/ HI98108 / HI98127 / HI98129 / HI98131,  Extech meter model Exstick H20, Oakton meters models pHTestr30, pHTestr50, EcoTestr2+.