Have four types all give different readings! Any suggestions on a accurate professional model?

 

How far off are the readings from each one?

 

Are you using the ball gauges that only test concentration or are you using the test strips that measure both concentration and PH level?
Example below
https://www.supplyhouse.com/Hercules...iABEgIaafD_BwE

 

I am using the Prestone guage with a reading on both sides and three different ball guages that seem to place the ***** up equaly three times. No test strips These new products today have little strenght unless you use the manufactures brand

 

I use a Prestone gauge with the swinging 'density' weight and an Indicator arrow....as long as you hold it straight..it's dead-nuts every time.

I had two...the original one died of the rubber bulb (like a turkey baster) dying of old age....45 years!

Unka

 

 

I use the same.

 

I have both the ball type and the swinging weight type. Both suck up the liquid . If I see dark green I'm good no matter what the the thing is suppose to read.