Measure your beeswax and oil in a pint jar on a digital scale. Put in a heavy bottom pot with a couple inches of water on medium low heat to melt the beeswax. You want to JUST melt the beeswax, so dont rush it or boil the water, just gentle steaming and maybe a few little bubbles in the pot of water. Stir a few times as it melts. Take out of the pot when there is still a few small chunks of beeswax left.
While the oil/wax is melting, boil some water. You're going to need about ⅔ of a cup, so start with more (I just boil my kettle).
After the water boils, zero out a wide mouth pint jar on a digital scale, and pour in water to get to 135 grams.
Your goal is for the water and oil/wax mix to feel in a similar temperature range. You could measure the temp with an instant read thermometer- and aim for 100-120F, but I prefer to just feel the jars. Do they both feel like a warm to hot cup of tea? Can you hold your finger in without it getting too hot? Let them cool if needed, pop one jar into the double boiler again if it gets too cold, this is the only finicky part in my opinion.
When they're ready, pour the water into the oil/wax jar. Put your immersion blender in the bottom of the jar, and turn it on. Allow it to whir for about 10 seconds, you'll want the bottom of the jar to be emulsified and look white not separated oil and water, before you raise the immersion blender. Blend to fully emulsify.
As the lotion cools, every 5-10 minutes blend it a bit again so that it stays emulsified as it cools.
If your batch separates, just melt it all again in the double boiler and reblend, making sure to give it a blitz with the immersion blender every 5-10 minutes as it cools.
Because this has no preservatives, and your household temps are all different, plus so many other factors...it's recommended you keep this in the fridge.