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4619 OTC Battery Hydrometer / Thermometer Fluid Tester

4619 OTC Battery Hydrometer / Thermometer Fluid Tester
 
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Price $16.22


Product Code: OTC4619
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Description Prop65
 
OTC 4619 Professional Battery Hydrometer - Displays a battery's specific gravity on an easy-to-read float; scale ranges from 1.100 to 1.300. Thermometer indicates what must be added or subtracted from the float reading to arrive at an accurate specific gravity reading for each battery cell. Flexible tip offers easy access to the battery cells while the battery is still in the vehicle.
Product Features
  • Displays a battery's specific gravity on an easy-to-read float; scale ranges from 1.100 to 1.300
  • Thermometer indicates what must be added or subtracted from the float reading to arrive at an accurate specific gravity reading for each battery cell
  • Flexible tip offers easy access to the battery cells while the battery is still in the vehicle
Temperature Correction
Specific Gravity of acid is temperature dependent. If the temperature is very cold or very hot this can lead to incorrect readings. To correct for temperature use the following equations the equations or below 70ºF subtract points (0.03 per 10ºF) and above 70ºF add points.

Correction factor = (0.331 x Cell Temp ºF - 23) / 1000 or 0.003 pts per 10 ºF
Correction factor = (0.595 x Cell Temp ºC – 12.5) / 1000

This is valid for 0-130ºF or -17.8- 54.4ºC

The following shows the approximate state of charge at various specific gravities at 77ºF / 25ºC.

Charged Specific Gravity
100% 1.265-1.275
75% 1.225-1.235
50% 1.190-1.200
25% 1.155-1.165
0% 1.120-1.130

Hydrometers are at best accurate to +/-0.005 points. Voltage can be used to estimate state of charge, however caution must be taken when interpreting voltage readings.



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