Southern Labware How to Calibrate Apera Instruments 20 Series Value Testers 1 3 Points Calibration

Notes:
1) For pH calibration, 1st point calibration must be 7.00 pH
2) For EC/TDS/Salinity's calibration, just dip the probes into accordant standard calibration solutions and follow the same steps in pH calibration.
3) 10.01 pH buffer solution is not included in the kit. Users need to purchase separately.

[anthonymurphy]

Make sure your sensor is clean guys. Mould likes to grow around the sensor so make sure that's not blocking the reading.

But, mine does not calibrate anymore. Stuck on 7.3 in 7ph solution. So I guess I have to use it with a 0.3ph in mind for today's brew fook

[dirtyhogarden]

you should never dip your pen into the solution bottle....pour some solution into another container other wise you have tainted ALL of your solution

[TheRealMichaelP]

I’m getting an error when I hit the button to calibrate after it’s calibration mode

[alllove]

Once the ph solution is used to calibrate do you keep the solution or dump it

[RexBorderCollie]

Mine shows 5.4, and I get er1. It doesn't calibrate itself. Garbage product, do not buy this. Returning it to Amazon