[JT118]

Ok 33 tips shows that you have not changed the config file in the TX sketch.

Go to the TX sketch and click on config file tab: scroll down and you will see this:

// Define Rain Gauge tip bucket value (mm)
// --------------------------------------------------------------------------------------
/*
Use 0.300 for standard FineOfset rain gauges (Datasheet value = 0.2794)
Use 0.200 for standard Davis rain gauges
*/
#define COLLECTOR_TYPE 0.300 // Please note: Values must be in metric units. Max. resolution: 3 decimal digits


// --------------------------------------------------------------------------------------

Change the #define COLLECTOR_TYPE 0.300 to 0.200 which I am fairly sure your gauge is. Your readout should now be 50 tips resulting in 10mm on screen ( and this should take 314ml of water to do ). This will, I think, be correct for your gauge assuming it is correctly calibrated.